Question

According to the U.S. Constitution, what is the age requirement for serving as a Federal Judge/Justice?

Answer 1

Well, as far as I think, their constituation sets no such specific requirements....
(some exceptions may be there (•_•"))

Hope this helps
@PoojaBBSR

Answer 2

According to the U.S. Constitution, they apply the “Rule of 80” for serving as a Federal Judge/Justice.

It means the judge’s age and his or her term of service must be a total of at least 80. 

The Rule of 8o is originally, the standard of 70 years of age and ten years of service.