I think once you get over 80 it is time to step aside and let the world move forward.

I don’t necessarily disagree, but how do we prevent this logic from being used to disenfranchise voters above the max age? If they’re not sharp enough to make decisions in the government, how are they sharp enough to vote?

I see two options, if we’re going to have limits on serving in Congress. One, they maintain the right to vote for the same reason 18 year olds do – they’re legally considered adults, and they deserve a say in matters that affect them, like wars. Two, people above the age can’t vote, but no law which passes can affect their day to day. They wouldn’t need to pay taxes, social security and Medicare payments would be guaranteed to not go down for them, and they generally aren’t held as autonomous adults in legal matters.

This is a can of worms, and needs to be carefully handled.