I don’t think an age difference matters if you’re speaking strictly about sex. I slept with a guy nearly 13 years younger than me after I left my husband (fun times) and married (stupidly) a man 8 years older. I also dated a helicopter pilot who was 9 years older than I was and our maturity levels matched, I felt, until I discovered that he was in fact married.
When it comes to relationships, a shared frame of reference and similar personal experiences is essential for the success of any relationship, I feel. If the age difference is too great, that will be difficult to find.
The guy that was 13 years younger was super interesting and funny and had a great job but in so many ways he was so immature. He died instantly after driving south in the northbound lanes of the 5 Freeway.
In my opinion, age differences are not as problematic as dating someone from a completely different socioeconomic background. I’m not being snooty, I have just never had good luck dating people who come from completely different backgrounds, from a wealth standpoint.
I’m 3 years older than my boyfriend of 2+ years, Darvie. I think we get on quite well together.