At 20 there is a world to explore. The social-programming is yet shallow, and you are defensible. Everything can be undone. Wow, isn't that wonderful?
At 20 we have a hero's vision of ourselves. It can be anything we want, because anything and everything is possible. You can be Julius Ceaser, Nikola Tesla, Wolfgang Amadeus or Sir Charles Spenser Chaplin or combinations of them.
But as the years pass, that hero seems to fade away, alas even die. That's sad. To see any hero die is sad.
After those blissful years of 20-something, why do people let their hero die? Why does ego and vanity take over?