Should There be an Age Limit for Political Leaders?

Seven senators are at least 80 years old. Is it time for them to exit?
https://www.washingtonpost.com/powerpost/senate-age-grassley-mecconnell-feinstein/2020/12/11/1f33b60a-3bd3-11eb-9276-ae0ca72729be_story.html 

Dianne Feinstein’s Missteps Raise a Painful Age Question
https://www.newyorker.com/news/news-desk/dianne-feinsteins-missteps-raise-a-painful-age-question-among-senate-democrats