A similar thing happened to me earlier this summer...
She is 27, I am single (separated) as well...50, but look 40ish, (from what many people tell me), and I guess because I'm very carefree, outdoorsy and active, I come off much younger than I actually am.
We met through work, but not AT work. (She works for a company we do business with...) I suspect she was looking for the stability and maturity of an older guy, and we seemed to hit it off quite well. It started out very flirtatious etc. so I asked her out, and we had a couple of very fun dates, but when I let it out that I was actually 50, it fell off the rails. I guess 40ish was OK, but 50ish was creepy for her.
My advice is don't stress about it. Age is a number... (once adulthood is attained of course), and don't worry so much about the numbers. Concentrate on compatibility. Have fun and live your life, and when you wanna bang a hottie, find an SP...