Ok, fair enough, lets ban such marriages.
Of course, if there are solid logical reasons for any government being able to do such a thing to its citizens, then that argument extends to other aspects of life and freedom, as well.
Certainly if you aren’t capable enough to get married, then you certainly don’t have the ability to VOTE.
Or drink. Or raise children or have sex.
Or get the DL privileges that any adult has.
Or...
Serve in the military
Enter into contracts
Have a credit card or buy anything on credit
Own property
Hold a job
Pay taxes
Let’s just have anyone between the ages of 18 and 25 become wards of the State. Between 18 and 25 there should be compulsory unpaid service to the State. They will live in Government labor/education camps where they will also not be allowed to drink sugary sodas.