Columbia subject headings:
Older people--Japan--Social conditions--21st century.
Social classes--Japan--History--21st century.
Social stratification--Japan--History--21st century.
Harvard subject headings:
Japan--Social conditions--21st century.
Social classes--Japan--21st century.
Social stratification--Japan--21st century.
Princeton subject headings:
Japan--Social conditions--21st century.
Social classes--Japan--21st century.
Social stratification--Japan--21st century.