Speaking of old posts, I still get comments now and then on my 4 year old inflation proposal on steemit.com. I never get any comments on any of my old posts on Hive.
https://steemit.com/steem/@demotruk/reduced-inflation-proposal
Mostly spam, but occasional real comments.
Yeah, I never get comments on old stuff either. Maybe I should check my STEEM account and see if there's any one pining for my existence over there. :D