At what age should one start thinking about getting married?

A friend of mine got married at the age of 20 and she's doing just fine, is it weird or normal to thing about marriage at that age.
At what age should one start thinking about getting married?
At what age should one start thinking about getting married?
Updates:
4 d
Right, you'll find the right one ok..
At what age should one start thinking about getting married?
15
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