You'll be surrounded with peers that are your age. You'll enjoy a very equal male/female ratio (at least in your living quarters and some courses), and you get to study a broad diverse set of topics constantly. And for the most part you get to select what you study.
To steal a famous quote -- college is wasted on the young. ;-) I think if you were to ask most 30-50 year olds if they could drop most of their current responsibilities (with impunity) and go to college full time, the vast majority would.
As someone who has started start-ups, joined start ups, consulted, and worked for F100 companies -- you have your whole life to work. I wouldn't start into it a day earlier than necessary.
With that said, there may be things you love that you can do as a job and things you can do to become very rich very young. I think those opportunities are fewer and rarer than most here believe, but they do exist.