I could see that IF the 14th Amendment were actually relevant here, that states would have to recognize marriages from other states, but to just tell a state that THEY MUST PERFORM THESE "MARRIAGES" is beyond the pail of despotism.
Good point about the ages require for marriage.
Suppose a 15 year old girl gets married in State A where it is legal but then moves to State B where it is not legal?
Is she still married and is her 25 year old husband breaking laws?
“I could see that IF the 14th Amendment were actually relevant here, that states would have to recognize marriages from other states...”
I think you’re mixing Article IV, Section 1 (full faith and credit) with the 14th Amendment (equal protection). The SCOTUS DOMA case cited the former. This case cites the latter.