I was taught that marriage is both a legal construct and a “spiritual” matter.
I would say the US government can only deal with the legal issues.
Legally can a 6 year old girl marry a 40 year old man?
not in the US
Is that “age” discrimination? I don’t think so ....its merely the parameters of the law
Is there a lawyer in the house?
And why are there "parameters of the law"? To keep society civilized. Without that construct there's mayhem.