Thats part of the problem! The states powers are not mentioned but your rights are listed? phooey!
Voting rights have everything to do with the government and the government by Constitution and statutes can provide for rules respecting them.
The constitution doesn't say that children can't vote, either. Should we give the vote to nine year olds?
The problem with this country is we have too many people voting already.
The 15yh Amendment does not list your rights to vote. It lists prohibitions against the States denying your right to vote. By simple process of deduction, if the prohibition is not listed the State can deny the right to vote unless other legislation is passed providing the right.
It doesn't take a constitutional amendment, just get a law passed.