Why People want to marry young girls rather than close to their age girls?

[Anonymous001]

In my family, we got a proposal from a doc, for my cousin. But the problem is she is still in 12th.
I mean that guy is well educated, his family must be educated, then why they are looking for so young girls for marriage.

I thought these things happens only in very rural areas and with literally uneducated persons.

keep your free opinion.

thanks.