Returning this year for the weekend but will opt for the quieter camps (no shame in that - I like my sleep nowadays).
I'm 32 but already started to feel old when I attended in my late 20s 😆 I find it the same as most UK festivals nowadays - you'll always have the idiots, but you'll also find like minded (and similar aged) people.
It's up to you what you get out of it. If you're worried about certain atmospheres, avoid them. Likewise, if you see/meet people you like, make friends and stick with them 🥰