re: Why is the the appointment to the Supreme Court a lifetime appointment? (Posted on 3/27/14 at 4:20 am to PrimeTime Money)
Personally I think it would be logical for a Supreme Court Justice to have some limit on their term. Something suitably long like 20+ years would seem reasonable. That is five plus presidential terms after all.
The best argument for doing this is to encourage the nomination of better qualified justices instead of just trying to nominate a 40 or 50 something with no record that you can sneak through the confirmation hearings. Retired justices with something left to give also have value to our society and they usually don't get to show that because they are so concerned with timing their retirements to control what type of candidate will take their spot.