Nope. There's no 'type' identifiers for swingers. All shapes, sizes, ages, backgrounds, histories, etc.
Some years back, a close friend of the family began exploring consensual non-monogamy. He told us about it, so we told him about us being swingers. He was absolutely floored, did not expect it at all; "YOU?!?!? NO WAY!" :) You never know.
Even if you think you know, you don't.