Too many youth in their twenties complain of feeling old these days. I don't think its due to any excess of wisdom in them. Its just a consequence of over expectation, or excessive ambition, and its entailing, overwork. This leads to nervous fatigue, and a general disinterest in things they deem 'useless', hence making them feel morbidly bored when they don't have work assigned to them. This makes them weary, and combined with the nervous dystrophy makes them feel old.
P.S: This post is meant for me to save my thoughts. I don't have the patience to create a private blog now just because a handful of people will be reading this post. So I've disabled the comment option instead.