APA (7th ed.) Citation

National Institutes of Health (U.S.). (2000). Are you ever too old to exercise? National Institutes of Health.

Chicago Style (17th ed.) Citation

National Institutes of Health (U.S.). Are You Ever Too Old to Exercise? [Bethesda, Md.]: National Institutes of Health, 2000.

MLA (9th ed.) Citation

National Institutes of Health (U.S.). Are You Ever Too Old to Exercise? National Institutes of Health, 2000.