They live in the political world of Washington, DC, which is insulated from the real world where ordinary citizens live. Because of this, no matter where they originated, they eventually forget what the real world is like. So, over time, their rulings reflect the thoughts and perceptions of the political class, rather than the people.
When a Supreme Court Justice needs to be appointed, his term is either 13 or 17 years (drawn from a hat).
That is one good idea. It would be nice to force this as a national issue, so that the problem of judges outstaying their sense of judicial wisdom can reach national discussion.
Where do I sign up?