In another perspective, ask your self if you want to see your children getting married, and then see your grand children (and perhaps marry them too :)

And then look at the average life expectancy of the place where you live. Simple calculation to arrive at the right age you should marry assuming that the above are important to you.

I admit that this might sound stupid to some.... but i have a friend who always said would wait a few more years before marrying and another married friend who wanted to wait a few more years before having kids. I put these questions to them and they were stunned ... hadn't thought about it at all till then.
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Quidquid latine dictum sit, altum sonatur.