It's kind of interesting in the resort we are in, a number of the older folks have been lobbying the owner to make the place a 55+ park so that younger folks and families are barred. The owner is smart enough not do do this as his "weekenders" (who pay a higher price than us "by the month types") would disappear. I'm glad he is resisting as it makes the park younger and we can bring our kids and grand kids in.
I had a laugh, we stayed a couple of times at the Fountain of Youth RV park near the Salton Sea, we aren't young but we were very "young" there, almost teens compared to the average age at the park.