This is something I've noticed and wondered about for awhile.
I see that the user "Community", which from what I understand is basically an automatic bot that scraps the site, sometimes makes questions from years ago active again.
If I take a look at the question's timeline there is no new activity besides Community bumping the post with a comment that says...
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
What is the purpose or hope in doing this? In a lot of cases I looked at the OP has very low rep and the question was asked years ago. So the OP is most likely long gone.
Sometimes, when scrolling through the questions, I find myself reading through one of these only to realize later that the question was asked so long ago, I feel like I just wasted my time. Should I be doing something when I come across these? Right now I just avoid them.