Bumping old thread message

On some forums I am on, if you bump a thread that is over a certain age (120 days on Calguns), you get a message saying "This thread hasn't had discussion in over 120 days. Are you sure you wish to bump the thread?"
On one hand, I wouldn't want duplicate threads being posted every time someone has a non-feeding baby or so forth, and don't want to intimidate anyone from posting if they have something to add. On the other, I think a lot of folks -especially those newer to message boards -find a topic by searching and don't notice the date. I'm not even sure *I* like the idea I'm proposing, just throwing it out there...