When you feel that a person is alive

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Hand-painted photograph “Cherry blossoms in Koganei (near Tokyo)”

It is often written in a book that says “have a hobby in old age.” Having a hobby must be an important condition for a rewarding life, but something is still missing.

What is it? And when does a person have the feeling of being alive? I also hear that “it takes a lot of time for people to have a fulfilling life”.

What does “rich time” mean like here?  In other words, what is the condition for feeling “fullness”? Indeed, it is not regulated by the act of having a hobby.

Reference

Koganei City https://www.city.koganei.lg.jp/smph/kankobunka/bunkazai/sakuraayumi/koganeibasi2.html