I would say 30 is the extreme cutoff. You're going to be almost 2 decades older than the average ATRL member.
I would never want to be over 25, let alone, over 30 on a site like this which is gearing towards teenagers and acting like a immature mess. That's like me being perched on Club Penguin. A real pedo sized mess.
At that time, you should be checking the outside world for enjoyment that's meaningful and not throwaway like this site.
Personally, I'm only going to be here until my faves' latest eras are over. After that, goodbye to this mess. I'll finally have more time to focus on my website plus my studies.