its funny the young misconceptions of age. even funnier is soon you will understand that age does not change who you are. it just adds life experience to your person.
Are you kidding I can see it and in some respects self-comparatively feel it happening.
There's tons of studies on the impacts of it. A lot of the mind and body's giving up happens around age 25, but in stages our components all have deteriorative lifespans on different time clocks.
there is no magic age where you become a different person with different ideas and values.
It's a gradual process that hides itself from us, but looking at who we used to be can show what's changed.
It's why time travel plots have fun with "past you" meeting "future you".