Have you ever tried to imagine what's in an old man's mind? I mean, sure, everyone knows that he's going to grow old and eventually die. But when you're young, it's impossible to imagine the world seen through the eyes of an old man. And old men mostly know very well that they can't explain it to a young son.
I'm not that old, but I have seen already my body and my expectations changing.
(Ok, I'll continue this another time. Now we have the cryptomarket falling: better not to add more sad stories ;) )
I drew this yesterday: