Columbia subject headings:
Age-structured populations.
Families.
Harvard subject headings:
Age distribution (Demography)
Age-structured populations.
Families--Cross-cultural studies.
Intergenerational relations--Cross-cultural studies.
Older people--Care--Cross-cultural studies.
Princeton subject headings:
Age-structured populations--Europe.
Age-structured populations--United States.
Families.
Family demography--Europe.
Family demography--United States.