Ten Year Limit for Supreme Court Judges

When a Supreme Court judge leans to far right or left politically it hurts all citizens of our country. We have in the past seen the extremely elderly judge sleeping instead of listening to very important issues, refusing to retire when he no longer should be sitting on the bench.
Judge Roberts, himself, at one time believed no judge should have a life time position as a Supreme Court Justice. That of course was before he became one himself and now the right wing leaning Roberts changed his mind since he is one and now believes it should be a lifetime position.
No job other than this one comes with a lifetime guarantee, and niether should this one.

In order to keep our country fair and our constitution safe we must occasionally clean house. When a judge asks if he is expected to read the many paged Obamacare health
plan we have a problem. When a judge refers to the 'Healthcare for all" as 'Obamacare,' doesn't want to read it ,how can we rely on these judges not to be biased?
No job should automatically be a lifetime position and certainly not one that affects all Americans as does the position of a Supreme Court Judge.