These "Life Lessons" from famous people go around the internet from time to time (and I've even posted some before) but this article from Jack Archer has truly practical advice that's all the more enjoyable to listen to coming from a master of cool...
Le Miroir (The Mirror) is a short film by Antoine Tinguely and Laurent Fauchère (credited as Ramon and Pedro) that depicts the life story of a boy growing up into an old man. The unique part of this piece, however, is that the entire story unfolds as the man is standing in front of his bathroom mirror.
It hits you hard. One day, you've realized those things you've clung to for the last decade aren't actually what you're going for. Perhaps, for previous generation, such enlightments really didn't come until middle age, when there are often kids, mortgages, and stock options involved.
But for an increasing number of young adults, mega-life changes hit in your twenties.