There is, in fact, no age limit for pilots in the United States so long
as they can continue to pass the appropriate physical commensurate with
the type of flying they want to do. The only limit in the U.S. is 60
for airline pilots.

Someone mentioned Bob Hoover earlier . . . he lost his medical after
some rather dubious observations were made by some FAA inspectors. He
fought a long and expensive fight (with contributions from many pilots
to help) to succeed in winning back his medical. A lot revolved around
the ability of non-medical personnel to make medical judgements. As
recently as a year ago, I saw something where Mr. Hoover was plugging
one of the new Very Light Jets, perhaps the Jet Maverick.

blue skies to all . . .

John