I'm sort of with Cataholic...I dont' think marriage makes sense unless there are kids involved. I know there are a lucky few that find "the one" and are together forever. I've always had long term relationships...10+ years. But I've always found that I grow and change and people grow and change and odds of us growing in the same direction aren't likely.
Regarding "celebrity" marriages, I think they are doomed no matter the age