Dianne Feinstein (D-CA) is running for re-election in 2018 at the age 85.

[Caliman73]

4. Term limits are a panacea.

They sound like a good idea but the reality is that they just bring new lambs to the slaughter and get rid of institutional memory. The problem isn't that people are in office too long. The problem is money in politics. With term limits you lose seasoned leaders but who stays around in Washington or State capitols? The lobbyists, and the staffers, who end up having out sized influence, especially over new and inexperienced politicians coming in.

Elections are natural term limits. The problem is that American voters are usually apathetic and/or ignorant. There are problems with the advantages that incumbency brings, but mainly it is the money and lobby strength that makes incumbency so difficult to get around.