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I've seen that on some forums indeed, don't know if that is something which is related to the forum itself or an addon.
However, if people still think they need a solution on a post which might not need or maybe has a total other solution nowadays, they still will post.
But some others just want to try to be of help, come via Google or something and didn't realize the old date. So such automatic warning would be a good thing anyway.
And then set it at a certain time. I don't mind if it's 2 or 3 years if it's still a current thing and a good addition which is posted or question.
For questions it's mostly better to create new, because in spite of how it looks, it's mostly a different cause, so better to create a new post anyway. Or else if a post is 4, 5 years old or older, create a new one and then refer to the older post that it might be similar, so others know they seen the solution in there.
It's also better to find own posts with solutions, not disturb the old posters if they still have the mail warning, and get new solutions to changes made in the years past.
I'm into forums like over 20 years now, also as admin, it works better. And for search engines too.