The subheadline lays out the problem:
Refusal of older officeholders to cede stage to younger faces is prompting fresh calls for a limit on how long they can serve
Statutory limits on how long Congressmen and -women can serve in Congress are constitutionally highly questionable. Here’s what Article I, Sections 2 (on Representatives) and 3 (on Senators) of our Constitution says about eligibility to serve in Congress:
No Person shall be a Representative who shall not have attained to the age of twenty five Years, and been seven Years a Citizen of the United States, and who shall not, when elected, be an Inhabitant of that State in which he shall be chosen.
And
No Person shall be a Senator who shall not have attained to the Age of thirty Years, and been nine Years a Citizen of the United States and who shall not, when elected, be an Inhabitant of that State for which he shall be chosen.
Our Constitution places a floor on age, but it places no ceiling on age, nor does it place any limit on the length of service or number of terms an individual may serve. In many venues, it’s possible for lower jurisdictions to tighten standards of higher jurisdictions, but with our Constitution, such efforts have been routinely disallowed under the Supremacy Clause, which unequivocally states, along with Marbury v Madison, that our Constitution is our supreme law, and Congressional statutes are subordinate to it. It’s most likely that imposing an upper age limit would require an Amendment to our Constitution.
In any event, limiting by age for how long a congressman might serve is a decidedly suboptimal solution to this perceived problem. A much better solution is the term limit that was used in our erstwhile Articles of Confederation. That document’s Article V limited a Congressional delegate to three terms out of six, with no bar on serving further in subsequent six term runs.
The Articles were written for a unicameral Congress, but it’s easily adaptable to our present bicameral Congress. This also would require an Amendment to our Constitution, but it would be a better one that makes medical improvements to the abilities of aging citizens irrelevant.