Totally agree, @rijalmahyad. Motivation (another name for passion) is the best fuel for learning. I am more than three times as old as the ages you reference in your post, yet I try to learn constantly. As a recent example, my interest in the whole blockchain, Steemit, bitcoin, and so on, is totally self-driven, because the problems they address are real-world and interesting to me What school teaches this stuff anyway?

Schools are not set up to break the rules, but rather to reinforce them.

So keep learning, no matter how old you are. Learning keeps you young.