In bed? Sure, no problem!
I'll admit I had a habit of ending up in bed with teenagers for a few years there but I've given it up. In relationships, I've been dating younger men since I was in the 2nd half of my 20s...except for my last boyfriend, who was 4 years older than me, but he was also anomalous in other ways. My current SO is 7 years younger than me or so, but I honestly don't notice the difference all that much. Mostly it means I can sing along to some older songs on the radio than he can, little things like that. By the time you're in your 30s you pretty have enough life experience (hopefully) to navigate your way through a relationship so it makes no difference to me. In general conversation it pretty much depends on the other person as to how willing or able they are to have a conversation with me - I have very little tolerance for boring conversation so if you want to say something interesting I don't care how old you are. If you have nothing much to say, I don't have time. I'm not an ageist, but overall as I've grown older I've found that the company of 19-year-olds isn't as desirable anymore, simply because the difference in experience makes it hard to relate so it's a bit of a strain.