Re: 18 and marriage?
True.. dono saath saath baray hon ge 
… He can get married if you ask him to lay down a plan on how he will be supporting his wife in the initial years and he will need to tell this to his future in-laws as they will want the security of their daughter…
If he has a feasible and reasonable plan in mind, you can start looking for the girls and families who ware willing to accept your brother as he is after knowing how he plans to support his wife in the initial years…