There should be a low upper limit as well as term limits. You should be expected to have multiple years of working after your term so in theory you have to exist in your own policy. Politicians should be 30 to 50, serve two terms and max out at two roles in state or federal. This would fit perfectly with the time frame where you could be in congress and then POTUS/VP/Cabinet or do Congress and then Senate and that is it.

The likelihood of this type of reform is 0.