Let's do it slightly differently, let's make the mandatory retirement age for political office the median life expectancy age for the entire country. If the politicians, etc can manage to make everyone live longer, they can hold office longer.
Similarly, take away their separate and different medical coverage and put them on the same Medicare system everyone else in the country has to use.
Force them to use the public option. Make a law to specifically disallow all congresspersons from enrolling in private insurance for as long as they hold office. Violation of that restriction is immediate ejection from the relevant legislative chamber.