“...there have been a few Supreme Court Justices that just wouldn’t retire.”
For an example, look up William O. Douglas. For sheer liberal arrogance, he makes RBG look like a schoolgirl. Douglas served longer than any other justice (36 years) and was famous for antagonizing his fellow justices. Forced to retire following a stroke, he continued to hang out at the Supreme Court building, a cantankerous old coot brandishing his cane at critics.
Douglas was perhaps the worst example of what lifetime tenure on SCOTUS can do to an entire nation.