I'm 29. Since I finished my undergrad I've gone to grad school, done work for huge companies, small companies, universities, and worked at a startup. I think all of these first hand experiences will prove to be very valuable in my future entrepreneurial endeavors. As always, YMMV.
Yeah, I found the phrase "we were both pretty old (27)" to be equal parts amusing and depressing. Sort of like when an intern in the office (after a few beers) told us he was dreading the day that he turned 20. That got a lot of chuckles from those of us with a few grey hairs.