An interesting proposal is being floated to limit Supreme Court terms to 18 years, with those terms being staggered so that one comes up every two years.
As much as I feel that thirty year veteran Justice, the late Antonin Scalia, was a great justice, this is a good idea. I wish it would get some traction, even though I know that it is unlikely to.
The fact of the matter is that any one U.S. Supreme Court justice has an inordinate amount of power and, by extension, it causes the dead hand of the President who nominated them to live on well after it should not. Scalia was nominated by the late President Reagan. Long serving and highly infirm Justice Douglas, served for forty years and had been appointed by Franklin Roosevelt, only to go out under Gerald Ford.
I'd also modify the proposal, were it me, to require a retirement age of age 70. I know that's an unpopular idea and it would mean that no justice over age 52 could be appointed, but so be it. Douglas is a good example of what can happen when very old justices continue to serve, but he's not the only one. The current system simply requires too much gambling.