We hang with people who are friendly and interested in hanging out. Some younger people and some older people and some I couldn't really guess. Nevertheless, you'll find someone at Temptations to hang out with. The things you can't avoid however is being around people who are older than you. So if some older people being around is a problem than Temptations is not for you. The place definitely has a party vibe and I don't think age is that big a deal.
I don't get why everyone is so sensitive about answering the question. No one made a normative statement but simply asked a question. Its "Temptation" by the way. We have been thrice. Estimate average age 40-55, but that also is on the tail of the distribution. Lots more people younger than 40 than versus older than 55, but the size of that group skews the average. If I had to say: 75%: 40-55 20%: younger than 45 5%: older than 55 We have not been to desire.
OP, you asked about age range averages for the resorts as a consideration for choosing one over the other. I understand why this may be one of your considerations for choosing where to spend your money for vacay. Others have offered the age range at TTR and the young spirit of all of the guests no matter the chronological age. I'd like to add something else for your consideration. I believe the choice between TTR and Desire is more about sexual freedom than age. Both offer great opportunities to meet good people and party hard day and night. Many choose to split time between to the two...the best of both worlds!