But that age isn't 18, and this holds true of other groups yet we still allow them to vote. If we are going to be applying some rational test where only people

But that age isn't 18, and this holds true of other groups yet we still allow them to vote. If we are going to be applying some rational test where only people who vote for the 'right' reasons vote, then we should do so uniformly and not discriminate based on a demographic that people have no control over.