Hmm no, I do get invited to pretty seriously non-mainstream parties despite being in my 40s. And I do go. I don't have a family so I don't have to schedule between birthday parties and judo classes.

But it's still not the same. I remember working in a bar in the 90s, thick with smoke, serving underage customers, staying open till 6am though we had a permit till 2, not caring about anything. Fuck the rules. Things were really much rougher then.

These days even the rough places are 'responsible'. No drinking if you're serving, no smoking because it's EU law, at 3am the lights come on.. Bleh. The "illegal" (usually meaning no permits) parties are a bit better but even they do most of this stuff. And they are hard to find not because I'm not invited but because nobody wants to organise them anymore.