Just like 16 years old people can’t vote because too young, 80+ years old people should not be able to vote, most of them are too distant from everyday reality of younger people to be able to take a wise decision for the community and also often stick with (way too) old ideals from their years
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The median age of people 18+ in the US (total potential voters), is 47. The 80+ demographic is really small. If those folks are voting in ways that are detrimental to others, the solution is to increase voting among other groups.
Make election day a mandatory holiday for anyone outside first responders, and guarantee those folks a half day. Expand mail-in voting. Expand early voting.
There are dozens of solutions that don’t include telling people they don’t get all the rights of full citizens.