The older you get, the less important it becomes. I'm not adverse to dating a 27-year-old as long as he's mature enough and mentally quick enough. The only problem I'd foresee is if you're both too far apart in age, you lose a generation of knowledge. You won't have similar references, and that can make conversation difficult.
FWIW: I'm 40.:hippie:
FWIW: I'm 40.:hippie: