Generally threads that haven't been posted on in about a month are considered old, to the extent that we'd rather not have people bumping them.
Most of the time, though, it's why a thread was bumped. If there seems to be a good, valid, obvious reason then it's normally okay and all's fine, but if a thread's old and is just posted on randomly... well, that's when the objections start.
Hope that makes some sense, x
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