I think you can start college pretty much at any age as long as you don't already have a degree. It's obviously a huge luxury to do so, but I think you're missing out on so much social and intellectual development if you do college now that it may be worth holding out for 3 years (or maybe more). I'm not saying that college now is completely worthless, but looking from the outside and listening to what students are saying, it seems severely diminished.