Which is why you should support this ruling. This is an Ohio issue. Not a federal one. This is keeping the Feds out of it. As far as the Feds are concerned, as long as anybody over 18 isn’t denied, and as long as they are not denied based on gender or ethnicity, they stay out of it.
To expound: if Ohio were to pass a law that raised the voting age to 19, it would be unconstitutional. If they were to pass a law denying blacks or women, it would be unconstitutional. If the pass a law lowering the voting age to 16, it WOULD be constitutional because they aren’t denying anybody.