Hiya, I've got a few friends over at Wharton who scored 660 - 680 and another friend who got into Columbia with a 650 (early decision), although she was a dame and that might have helped. She also got 650 twice but managed to score higher in Q once and higher in V the other time, so that may have counted somehow, as well.
However, all of them had meaningful experiences, and more importantly, where able to convey them greatly in their essays. Even when years of experience do not count directly, the "depth" of experiences does count. Outstanding individuals may achieve great experiences in a short period of time (and that's the young 'uns getting accepted). Yet, most of us (the "just great" bunch) will need to build those experiences over a longer period.
My suggestion, get someone to look into your profile and assess your chances. You may wish to wait an extra year not only to improve your chances but also to make the most of your education. Or if you have decent chances maybe move your GMAT a little bit upwards?
Hope it helps and for the record what I wrote are biased opinions based on other people's experiences and nothing more.
Cheers. L.