I used to hate when this happened to me. Someone reviving a post from ages ago to answer a question that I already found months/years ago.
But hey, it could help someone else in the future if I didn’t go back and post the answer to my own question (spoiler alert: I didn’t) so now I just do what OP does and thank them for their time, move on with my day. Chuckle at the stupidity of my youth.
Some people get angry about things like that. Just be chill, they probably didn’t notice how long ago it was posted.
I’ve always wondered what it’s like.
Turns out, (according to the US government) I was experiencing it all along.