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Personally, I used to report every bumped topic older than 3 months. I don't see why should a discussion be made after such long period.
If an old topic contains genuine information and is very important to the community then it is ok. Other topics have to be used as a reference in a new topic (season 2 somehow).
Well this is a difficult one. I think you really should look at the content and the quality of the new message. We don't want people to start a new thread about marriage, or Merit or Ripple or whatever, every other 3 months, do we? If they really can't resist pumping their Activity, I'd rather see them keep their irrelevant nonsense in the old topic instead of opening new ones.

I prefer to start a new spammy topic rather than spamming an old one. This way you can detect new spammers at least.
And what's wrong with starting a new marriage (topic) every so on? Some people want to discover new...experiences