Retiring young has unique challenges. If you're not a social butterfly, you will be cut off from the normal socializing and networking that goes along with having a job. Second, all of your friends are still at work so it's not like you can call them up and hang out like you did in high school or college, plus they usually have a family to tend to after work. Third, you do need passions, hobbies, and [new] goals of your own; these are the things that give meaning to life and without them you'll definitely suffer from boredom, loneliness, and mental degradation. This is why retired people often decide to work again. The bonus is that you can work on things of your choosing rather than out of necessity. Work at something you enjoy, start up a business, or chase that childhood dream that you completely forgot about when the pressures of the real world began exerting itself.