Why do we feel old? Is that because we need to forcefully do things we did in the young years?

I dunno, I know many people who sometimes feel old and label their actions based on the fancyness or on the oldness of the action, but I’m not sure if there is such a thing like an action that’s older to do.

You do it and that’s it. You don’t judge the action itself.
If you feel sleepy and want to sleep, why would you consider it something an old man would do?
yes, they certainly do that, but does doing that makes you an old man? Not so sure.

Our actions are just actions, doesn’t matter which age we do them.