Seeds Sown in Your 40s Sprout in Your 60s: 9 Small Habits Recommended by Experts

Hello everyone🤣. I am Onshi no Tabako.

Once you pass the age of 40, health topics suddenly stop being someone else's problem. While reading an article in The New York Times where experts were interviewed on "9 things you should do in middle age," I opened my notebook and took out my red pen. As a business owner, I have a habit of doubting numbers, so I went back and checked the source papers for all nine items. As a result, I arrived at a conclusion opposite to the Japanese version's title.

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Cardiovascular disease, diabetes, cancer, and dementia. The "seeds" of age-related diseases are generally sown during middle age, between 40 and 60. Professor Margie Lachman, a psychologist at Brandeis University, described middle age as the "ideal time to make changes." This is because it is the only period that yields dividends for both your current self and your future self.

And when you read through all nine items, a common design philosophy emerges: frequency over intensity, regularity over quantity, and systems over willpower. The key was not flashy, multi-week initiatives, but how to convert them into habits that last a lifetime.

Chapter 1 | Cardiorespiratory fitness is the currency that determines your range of motion in old age

Associate Professor Guillem Gonzalez-Lomas, an orthopedic surgeon at NYU Grossman School of Medicine, describes cardiorespiratory fitness as "one of the best indicators for longevity and whether you will be able to move around actively in the second half of your life."

This is no exaggeration. In a study of 120,000 people published in JAMA Network Open (2018), the group with the highest cardiorespiratory fitness had an approximately 80% lower risk of all-cause mortality compared to the low-fitness group, and no upper limit was observed where "training more would be meaningless." This association is stronger than that of smoking or diabetes.

As for the method, rather than continuing on a treadmill at a steady pace for 30 minutes, 10 sets of 30 seconds of maximum effort and 30 seconds of rest. The ideal is for it to be shorter in time but more intense, and as the professor says, "you really need to push yourself." Multiple meta-analyses have also shown that high-intensity interval training can achieve VO2max improvements equal to or better than conventional endurance running in less time. For the busy middle-aged, this is also a matter of time.

Chapter 2 | Socializing is underestimated as a health practice

Dr. Ezekiel Emanuel of the Perelman School of Medicine at the University of Pennsylvania (author of "Eat Your Ice Cream") points out that "not many people think of social interaction as an intervention for health promotion." However, he suggests that interaction with others might be "perhaps the most important health practice."

It makes sense when you look at the numbers. In a meta-analysis (2010) by Holt-Lunstad et al. that integrated 148 studies, people with strong social connections had a 50% higher probability of survival compared to those with weak ones. This is often cited as an effect size comparable to quitting smoking.

That said, it is extremely difficult to coordinate schedules with friends in middle age. That is why Professor Lachman recommends the "killing two birds with one stone" strategy. Clear your to-do list together with someone. Go for a walk together, do strength training together, or even go grocery shopping with a friend. Instead of carving out new time, layer people onto existing time. It is the same concept as not setting up a new project when there is no budget, but instead piggybacking on existing operations.

Chapter 3 | Feed your gut

Dr. John Beard of the Columbia University Mailman School of Public Health says not to forget the trillions of microbes that live in your body, the microbiome. Gut flora is closely related to the immune system and suppresses inflammation in the body. And inflammation is the primary cause of many age-related diseases.

Research is still in its early stages, but there is promising evidence. In a 10-week study at Stanford University (Cell, 2021, 36 subjects divided into 2 groups), the group that consumed 6 servings of fermented foods per day showed increased gut bacterial diversity and a decrease in 19 types of inflammatory proteins including IL-6. Interestingly, the high-fiber diet group did not show the same effect.

A bowl of yogurt in the morning. Kimchi, kombucha, kefir, sauerkraut. This is an advantageous item for Japanese people. Miso, natto, nukazuke, amazake. They are already in the refrigerator.

Chapter 4 | Muscles are independence itself in old age

An increasing number of studies show that, along with cardiorespiratory fitness, muscle strength is directly linked to longevity and independence in old age. In multiple cohort studies using grip strength as an indicator, muscle weakness was an independent predictor of all-cause and cardiovascular mortality. Conversely, excessive muscle weakness increases the risk of frailty. In Japan, it is reported that approximately 8.7% of people aged 65 and older are frail, and 40.8% are pre-frail, so this is by no means someone else's problem.

And strength training has a byproduct. Muscles under load release signaling molecules called "myokines," some of which suppress inflammation in the body. This is one of the molecular-level reasons why exercise is said to be medicine.

The words of Gonzalez-Lomas are a comfort. Even for beginners, "with strength training, anything you do will be effective." The goal is to push yourself to the point where you feel the load on your muscles and start to feel fatigue. Both the WHO and the Ministry of Health, Labour and Welfare's physical activity guidelines recommend 2 to 3 times a week of strength training.

Chapter 5 | Protein: Pay in Installments, Not a Lump Sum

Muscle mass begins to decline from our 30s, at a rate of 3–8% every decade. This decline accelerates in our 60s. Dr. Elena Volpi of the University of Texas at San Antonio (the author of a representative review in this field) emphasizes that extreme amounts are unnecessary.

The guideline is 0.8 to 1.2g per kg of body weight. If you weigh 68kg, that is 54–81g per day. Since the recommended amount in the Dietary Reference Intakes for Japanese (2025 edition) is 65g for adult men and 50g for women, we are looking at roughly the same picture. However, 0.8g/kg is the minimum line to prevent deficiency, and international recommendations that prioritize the prevention of frailty in old age tend to recommend 1.0–1.2g/kg.

What Dr. Volpi emphasizes is distribution. A little bit at every meal. Since there is a limit to the amount the body can process at one time, it is more efficient to spread it out over breakfast, lunch, and dinner rather than eating it all at once with a steak at night. This was a painful point for someone like me who skips breakfast and makes up for it with a protein bar.

Chapter 6 | 7,000 Steps: A Realistic Target

Dr. Volpi says, "I call it 'physical activity,' not 'exercise.'" It is the idea of weaving movement into your life, not just setting aside time for the gym.

Here, a famous number comes up. A meta-analysis published in The Lancet Public Health (2025) summarized over 160,000 people across 57 studies. About 7,000 steps per day was associated with a 47% reduction in all-cause mortality, 25% in cardiovascular disease, 38% in dementia, 14% in type 2 diabetes, 22% in depression, and 28% in falls compared to 2,000 steps per day. The authors state that this is a more realistic target than the unofficial standard goal of 10,000 steps.

However, three points of caution. First, the comparison group is the extremely low 2,000-step group. Second, the paper itself admits that the number of studies on cancer and dementia is small and the certainty is low. Third, while improvements in heart disease continue beyond 7,000 steps, the effects plateau for many other items.

And here is where Japan stands. According to the 2023 National Health and Nutrition Survey, the average number of steps for people aged 20 and over is 6,628 for men and 5,659 for women. 7,000 steps is a line slightly above the average, not an easy goal. Take the stairs instead of the elevator, walk instead of driving, and if you must drive, park further away from the entrance. It is a distance you can reach by accumulating these "extra steps."

Chapter 7 | A Health Method That Only Needs to Be Done Once

Emanuel says, "This is the easiest thing to do. Because, unlike most wellness methods, it only requires one vaccination."

There is growing evidence that the shingles vaccine also has the effect of preventing dementia. The core of this is a natural experiment in Wales published in Nature (2025), which utilized a system where eligibility for vaccination was mechanically cut off by date of birth. In a 7-year follow-up, the probability of a dementia diagnosis fell by 3.5 percentage points, or about 20% in relative risk. The effect was more pronounced in women.

However, this was not a randomized controlled trial, and the vaccine used was a live vaccine. The causal relationship is at the "suggested" stage, not confirmed. As one hypothesis, it is thought that by preventing infectious diseases, the vaccine protects against major factors of inflammation in the brain and body. Certain effects are also expected for influenza, pneumococcal, and Tdap (tetanus, diphtheria, and acellular pertussis) vaccines.

In Japan, the shingles vaccine became a routine vaccination (Class B disease) in April 2025. The target age is 65, with transitional measures for 2025–2029 for those aged 70, 75, 80, 85, 90, 95, and 100, as well as some aged 60–64. Since out-of-pocket costs vary greatly by municipality, I recommend checking your local government's website. For readers in their late 30s and 40s, this might be an item to check your parents' vaccination status before your own.

Chapter 8 | Write Down Your Parents' Medical History

While it is true that lifestyle habits influence risk, genetics also play a certain role. Dr. Volpi recommends understanding what diseases are common in your family and consulting your primary care physician on how to manage long-term risks. Ask what signs or symptoms to watch for and what can be done about them.

This is the only one of the 9 items that costs zero and can be completed in 30 minutes. Moreover, if you put it off, there will be no one left to ask. During my New Year's visit home, I asked my parents and parents-in-law about their medical histories and put them into a spreadsheet. The awkwardness only lasted the first 3 minutes.

Chapter 9 | And, Consistency Over Sleep Duration

Sleep deprivation is linked to obesity, diabetes, heart disease, dementia, and a shorter lifespan. The advice to "get 7 to 8 hours of sleep" is easier said than done. The average sleep duration for Japanese people is 7 hours and 22 minutes, the shortest among 33 OECD countries, with 37.0% of men and 39.9% of women sleeping less than 6 hours; this figure exceeds 40% among the working-age population.

Therefore, experts recommend focusing on the sleep environment and a consistent bedtime rather than just the numbers. Recall the study by Windred et al. mentioned at the beginning. By tracking 60,977 people in the UK Biobank for over 6 years, it was shown that sleep regularity is a more powerful predictor of mortality risk than sleep duration. The top group with high regularity had a 20–48% lower risk of all-cause mortality and a 22–57% lower risk of cardiometabolic disease mortality compared to the most irregular group.

This is the trap of the Japanese title. If you read "Don't be satisfied with 7 hours of sleep" as "sleep more," you will end up frustrated by an impossible goal. The correct interpretation is, "look at whether you are sleeping at the same time every day, rather than whether you are getting 7 hours." The point is that people who sleep 5 hours on weekdays and 10 hours on weekends for an average of 7.5 hours are the most at risk.

Furthermore, the Ministry of Health, Labour and Welfare's "Sleep Guide for Health Promotion 2023" sets 6 hours or more as a guideline for adult sleep duration, but is shifting toward prioritizing "a sense of restorative sleep" over the duration itself. This is consistent with international research trends.

The order to start from tomorrow (in order of ease of implementation)

First, decide on one bedtime and keep it within ±1 hour even on holidays. Next, create one rule for choosing stairs (e.g., take the stairs up to the 3rd floor). Fix natto or yogurt in your breakfast routine. Schedule one appointment with a friend to be converted into "exercise while socializing." Set aside a 10-minute slot for strength training twice a week on your calendar. Spend 30 minutes asking about your parents' medical history. And open your local government's vaccine subsidy page just once.

With these seven actions, you can begin 8 out of the 9 items.

【Q&A】

Q. I often can't get 7 hours of sleep; is it too late for me?
A. No. What this group of studies shows is that the lack of daily variation is more strongly associated with mortality risk than the absolute value of time. Starting by fixing your wake-up time is sufficient.

Q. Isn't interval training dangerous?
A. Because it is high-intensity, those with risk factors for heart disease or those who have been away from exercise for a long time should consult a doctor before starting. The experts in the article also assume that you are "pushing yourself."

Q. Is there no point if I exceed 7,000 steps?
A. While the effects plateau for many indicators, it has been reported that improvements continue even beyond 7,000 steps for cardiovascular disease. Those who can walk more are welcome to do so.

Q. Should I get the shingles vaccine to prevent dementia?
A. Vaccination for that purpose is not currently recommended. This was an observational study based on a natural experiment, and the subjects received a live vaccine. Please make your decision based on the original purpose of preventing shingles itself, and consult your doctor about whether or not to get vaccinated. I am not a doctor, so this is for information purposes only.

Q. Will drinking protein solve it?
A. As long as the total amount is sufficient, it doesn't matter if it's from food or supplements, but the point is the distribution rather than the total amount. It is emphasized to divide it into every meal and combine it with strength training.

【Summary】

Middle age (40–60 years old) is the time when seeds of age-related diseases are sown, and habits during this period determine your later years. The 9 items listed by experts are: interval training, exercising while socializing with friends, fermented foods, strength training, divided protein intake, daily physical activities like taking the stairs, vaccination, understanding family history, and a consistent bedtime. The most important finding is that "sleep is about regularity rather than duration," and in an analysis of 60,977 people in the UK Biobank, regularity was a stronger predictor of mortality risk than sleep duration. About 7,000 steps per day is a realistic goal (a 47% reduction in all-cause mortality compared to 2,000 steps). The average number of steps for Japanese people is 6,628 for men and 5,659 for women, and over 40% of the working-age population sleeps less than 6 hours.

【Sources】
・The New York Times "9 Things Experts Wish You'd Do in Midlife to Increase Longevity" (July 28, 2026)
・NewsPicks article "[Health First] Don't be satisfied with 7 hours of sleep from your late 30s"
・Windred et al., SLEEP 2024;47(1):zsad253
・Ding et al., The Lancet Public Health 2025
・Eyting et al., Nature 2025
・Wastyk et al., Cell 2021
・Holt-Lunstad et al., PLoS Medicine 2010
・Mandsager et al., JAMA Network Open 2018
・Volpi et al., 2004
・Ministry of Health, Labour and Welfare, 2023 and 2022 National Health and Nutrition Survey
・Ministry of Health, Labour and Welfare, Sleep Guide for Health Promotion 2023
・Dietary Reference Intakes for Japanese (2025 Edition)
・Ministry of Health, Labour and Welfare, Routine Shingles Vaccination

This article is a summary of general health information and is not advice for diagnosis or treatment. If you have an underlying medical condition or are taking medication, please be sure to consult your primary care physician.