What's a good age in your opinion to "settle down"?

Out of curiosity, what age do you think is a good age to settle down? As in, get married, start having kids, going out less (partying), etc? I'm only 22 and half of my friends are engaged or married with kids. The other half are drunker than snot half the time. Just wondering in your guys opinion what age, if you had to choose, would be the best for settling down! 

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