I was just riffing on what OB said about still being effective in politics into their 70's. We could as easily amend this to be that they cannot run after age 67, so at 67 is the last time they could run, meaning ending their last term if they get 8 years at 75. Seems somewhat reasonable. Although I agree with you about younger being better for our president. I wouldn't mind if they cut it off at 60, that at 60 is the last time you can run for office, with a single re-election allowed past that if you get elected, and that could go for any politician in the country. Senate or congress, last time to run it at 60 years old, and if your final term takes you past 60, say it ends when you are 61 or something, then that is it, you retire. Done and done.
Then they can become lobbyists for 10 years and add millions to their already hefty wealth. Seems like a win-win to me.