Why not? The Constitution says judges may remain as long as they remain on good behavior. I've long said that "good behavior" means preserving, protecting, and defending the U. S. Constitution and if any federal judge is found to have clearly and repeatedly ignored or wrested the text or best original good-faith understanding of the Constitution, he is NOT on good behavior and may be impeached.
OK, now think about it in practical terms. How does this actually happen.