Writing is one of the best hobbies to have, because you can always get better at it. With most things you reach a peak, then your body starts to fail you and you’re done with. Writing, though, can only get better with experience, and as long as your mind is healthy you can keep doing it until you die.
The older you get, the more you will have read, and the more you will have done and experienced, and the more interesting ideas you’ll have. And thus, the better writer you’ll be! It’s nice to know there’s no ‘prime’ I’m going to be past, until my mind starts to go, at which point there is nothing else to do anyway.
Read, write, repeat!