Threads are like plants. If you don't revive them, they die. ;P
I don't mind continuing discussions 9 years later... The op throws a seed and people build on the discussion? Why not, even if the op is gone forever. We're not.
If not, why not auto-close them after a certain time? What is considered too old?
Played Sims 1 when I was a teen... Still playing Sims...
Learn more about my Polar Bear (Sims 4):
Grisby legacy in Riverview (Sims 3):