Came out at 24. Got into an LTR at 25. Dropped out of that at 41. Slut stage started then!
You're never too old for it!
Granted, I've found that it didn't last too long for me, and as I'm really more interested in making a connection with a guy, the hookups make me feel like I've eaten a bag of potato chips: a rush while you're doing it, but leaves you sick to your stomach afterwards.
Now, if I could just find a friend with benefits.