Columbia subject headings:
Aging--United States.
Older people--Care--United States.
Harvard subject headings:
Caregivers--United States--Statistics.
Older people--Family relationships--United States--Statistics.
Older people--Home care--United States--Statistics.
Princeton subject headings:
Caregivers--United States--Statistics.
Older people--Family relationships--United States--Statistics.
Older people--Home care--United States--Statistics.
Statistics.