Act Your Age

Act your age, whatever that means. I wonder how many people feel th age that they are?
When I was young, teens/twentys I felt as if I was older, but then in my 30s I felt as if I was in my 20s. And now in my 40s, I feel about the same Its probably not true. My life is very different than 10 years ago. I live in a diffrent country; I have a child.
I’ve been watching these older YouTubers in their 50s & 60s and wonder how old they feel? Even the interviews of 80+, it seems they don’t feel /think/ precieve they are that age. I suspect it will be the same for me when I get there.