I'll be in my 50s when 20 years comes around. Depends on server costs etc. I can see myself using this until then. Transition would be eventually just to IRC or maybe Discord.

As far as actual discussions go, I've definitely gotten less verbal. I'm less reactive towards stuff I watch now. Stuff is enjoyable, not, or meh and that's about it. In very few series now do I have heated discussions about plot points or morality issues. I don't know how much of that is me getting old, or the shows, or just the difficulty in having discussions in a small group that is further divided into those who've seen the manga and those who haven't.