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I have seen that scenario as well - when people really want to be married, they tend to end up married. It is almost like some sort of gravitaional pull that puts married minded people in orbit with each other.
Not saying that all the marriages are good or lasted - just that when someone really wants to be married, they tend to find someone else in that frame of mind and together they end up that way.
The interesting thing I have noticed is, that dispite the popular conception of men and women, a lot of never married men in their 30's seem to have a biological clock as well as the better known clock attributed to women. Men seem just as interested in coupling and having children as women do.
Not that you would believe it if you follow pop culture crap.