On this site, it's that the <25's are 20000x more "vocal" than the others in certain areas of the site... and then there are other demographics that are more vocal in other areas. However, I would say the "majority" demographic, the one that STAYS for a long period, on the site is 25-50. Given that, how many of them are "single"?? Depends on your definition of "single" now, doesn't it? LOL... and what exactly you are looking for...
There are definitely plenty of 30-39yo single, female, submissive women hanging around. But that's an overly-broad definition in some respects, and incredibly over-narrow in other respects... Age is but a number. It's the maturity that really matters. There are many people here that are 35 that act like they are 15, and there are a couple of 22yo that act like mature adults. Depends on the person...