Columbia subject headings:
Harvard subject headings:
Ability, Influence of age on--United States.
Fire fighters--Rating of--United States.
Older people--Functional assessment--United States.
Older people--United States--Functional assessment.
Police, Rating of--United States.
Retirement age--United States.
Retirement, Mandatory--United States.
Princeton subject headings:
Ability, Influence of age on--United States.
Fire fighters--Rating of--United States.
Older people--United States--Functional assessment.
Police--Rating of--United States.
Retirement age--United States.
Retirement, Mandatory--United States.