Perhaps you should say there should be mandatory retirement even of members of the court, members of the federal judiciary. I'm sure there can be questions about whether one does as good work when you get into your - you know, I'm 67.
It is always possible for the court to overreach its proper bounds and perhaps declare a lot of laws unconstitutional and frustrate the will of the majority in a way that it ought not be frustrated.
If you could say of any one individual that the court as an institution is the length and shadow of that individual, surely it would be John Marshall.