Most Helpful Guy
I'd say this happens more after the 30's because for most guys, the testosterone haze dies down enough where they gain more control.
I've been single for ages and plan to keep it that way. Only one girl in the last 10 years made me briefly reevaluate my stance, but after about 2 days of weighing up the pro's and cons, freedom still won out.
Bear in mind the girl was an attractive, half my age (she thought we were the same age though), very intelligent, well spoken, and easy to get along with girl.