You are so right. After a certain age, I can say between 20-25, the time passes by so quickly. You can't stop it, it is like going away from your hand. I feel that for a while.
Thus, we should do whatever we want in time. Otherwise, it is quite likely we could miss the chance. Now I understand very well why old people around me used to say "Wish I was at your age".
Surely the time will come when you will say the same. That's life!