I am not a fan of term limits but do favor mandatory retirement at age 70 for all judges, senators and representatives. Not retroactive but from now forward. It would be fair to all and best for our nation. Maybe 70 being the last age you can run for office, so you can serve until 72 or 76. Thats it.
No. Its not an age thing. People can be very effective and productive in that capacity into their eighties.
No reason though they should be in there for life reaping ridiculous benefits from nefarious sources interested in their power getting their loser family members all kinds of perks.