[2inVT]

Another factor is that when a younger couple, as in the OP, goes to a party/M&G/club and finds very few people their age there, they just don't go back another time. This just makes it evolve into a gathering of older people.

I have the impression that people in their early 20s are way less likely to be interested in us 40-somethings. We, at our ages, tend to not look for anyone under, say, 35 - mostly because we can't imagine they'd be interested in us.

As far as drama goes, we're more apt to avoid people based on how long they've been swinging, not how long they've been together or how long they've been married. The drama we've seen has mostly been from newbies. Whether you've been married 30 years or 3 days, watching someone else fuck your spouse for the first time can be upsetting.