In my opinion Congress needs to change the Constitution, according to Article 1 sec 2 you only are required to tell Census how many people live in the house.
That’s the only thing I’ve told census takers the last two cycles. If an implied right to privacy allows abortion, then my right to privacy allows me to not tell some FedGov busybody how many bathrooms in my house. Among other things.
Citizens with their age give the number of eligible voters in any one district. A valuable stat.