Depend upon it, sir, it is dangerous to open So fruitfull a Source of Controversy and Altercation, as would be opened by attempting to alter the Qualifications of Voters. There will be no End of it. New Claims will arise. Women will demand a Vote. Lads from 12 to 21 will think their Rights not enough attended to, and every Man, who has not a Farthing, will demand an equal Voice with any other in all Acts of State. It tends to confound and destroy all Distinctions, and prostrate all Ranks, to one common Level.
-John Adams
Here is what Adams wrote when talk of expanding the franchise came soon after ratification, which by the way would not have happened if the Constitution granted voting rights to women, children, and the poor.
What?
Adams, great as he us, is one man. Not a whole population or even the group of Founders.
Just admit there is no qualification in the Constitution, created by the Founders.