Not that I'm the most experienced fella out there or anything, but from personal experience I can tell you that healthy, consensual sex with a woman fifteen to twenty years your elder is really not that awkward at all. The only less pleasant parts are when the woman decides she wants to keep you, and you're not wanting to be kept all that long. I mean the sex was amazing, and that was something we kept going for a while. A relationship? Not exactly what I was looking for at the time.
This was probably the exception to the rule, if what I've heard from others is accurate. Most mature women that like younger men know it's just a short term arrangement.
Wouldn't know anything about the ten year old comment, apart from having been that age once. No basis for comparison here. Hopefully you said that just to try to get some shock value, otherwise you should probably be hunted down, locked away and put into therapy for a LONG time, then monitored for the rest of your natural life.