Is 40 considered middle-aged?

Yesterday, I posted a tweet about reading a book called 'How to Shine'.

I wrote that it was published by note, but it seems that was actually incorrect.
For details, please take a look at the comment section of the article below.

I thought it was an interesting method, and at the same time, I felt like I don't know anything and haven't done anything.
People who take a step forward are truly wonderful, after all.

It's no use just marking time without doing anything.
It is important to move forward, even if it's just a little bit.

I was given a lot of courage by the words Tokotoko Story-san left in the comment section, so I would like to share them.

I thought it was such a wonderful sentiment.

There is no doubt that being younger is more advantageous for starting something.
However, I am sure there is a world that can only be seen because I have aged.

There is no point in thinking of age as a shackle, and if there is something you want to do or a challenge you want to take on, you should do it.
It is better to regret doing something than to regret not doing it.

It is a common saying, but today is the youngest day of your life.
That said, it will surely be okay even if you start tomorrow.

It's not bad to learn something you didn't know today and start tomorrow.

I was given courage.
Thank you very much!

Yesterday's article.

I want to live a little more in line with my name.