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Should There Be An Age Limit On Voting?
Older people are more likely to suffer from cognitive issues which may affect their ability to cast an informed vote.
Society prevents people under the age of 18 from voting because their cognitive abilities aren't sufficient to make informed decisions. As the cognitive abilities of people decline as the become old, they should also be excluded from the voting process.
Old people can be affected by the Alzheimer disease, which makes them unreliable to choosing the right decision.
That is a reason for why those who suffer from significant cognitive restrictions shouldn't be allowed to vote, not that all old people should be excluded from voting.
This is using age (A secondary characteristic) to get at something else that elderly people often (not always) share such as failing mental function. In such cases, good policy is to target the primary characteristic. In this example it would be failing mental function.