If it helps - we've been to RM 2 or 3 times and to Hedo once, as well as several just-nude beaches in the U.S. This is our first visit to Pearl. We are 47 (me, wifey) and 43 (yeah, I like 'em younger too). We went our first time a bit nervous about the nudity and what else would go on, but dove headfirst in and never looked back. Our experience is that there definitely are couples of all ages, but the average age does tend toward 40s as that's often when people 1) can afford a bit nicer vacations, 2) can get the time to do so, and 3) become more comfortable in their own skins (or maybe I'm just projecting from a sample of one couple, us). I saw a few couples in their 20s when there, more in their 30s, and I think most were around our age. Some into 50s and 60s, which I thought was very cool - I want to be having that kind of fun when I'm 60 too! Don't you?
My husband and I are physically fit (I am 5'3" and <120 lbs and he's fit as well). We like to think we're fairly good-looking and most people who meet us think we're younger (never having had kids helps with that - both body and never having had to grow up). Many couples there were fit too - not that it's ALL about appearance, but to me, there was a lot of eye candy, both male and female. We were in Hollywood, FL once and saw a group that was heading off on a naked cruise and were NOT overwhelmed by bodies/beauty, so I get it. We both thought the Desire crowd was good to look at AND absolutely amazingly fun to hang out with. CHEERS to the person who said they'd rather have a blast with a 7 than stare at a 10. Plus 10s are usually pretty boring and stupid, IMO. Ha! That said, I've seen stunning women (smooches to Judie and Bob) and some very handsome men every visit (hellooo "Mr. Big").
We do not swap - we discussed what we would be okay with or not at great length beforehand and as a consequence, we have LOVED being there and only got irritated with each other once when I was too hungover to go out one night

. We generally like to see and be seen - and think about that, if that's what you like: no matter who is watching, you get to put on your own show and enjoy that. We had so much fun with just being a bit of a show - in the hot tub (body shots!), in the hot tub beds, and in the playroom in RM (next to and sometimes "with" others), PLUS wearing crazy see-through outfits and strutting your stuff. Living out our fantasies as well as dancing all night - and when you get horny dancing in your slutty outfits, you can just run off and do something about it right then and there. It's awesome! I have had a few experiences with women and would probably be a "2" on the Kinsey scale, but didn't really think about hooking up with women when we went. However, it happened - every time. These experiences all happened because someone else was the aggressor, not me - and I thought those women - and their men - were all sexy as hell. Regardless of age. And with hot bodies (some of whom were "hot bodies" like models and some who I just found super hot in their confidence, fun, and overall beauty).
FYI - I hated Hedo and would never go back there. Desire is far and away MUCH much more enjoyable and classier. We love being in the couples-only atmosphere of Desire, and we're really looking forward to experiencing the nicer rooms and beach, and bigger pool and hot tub that Pearl seems to have over RM.