Columbia subject headings:
Harvard subject headings:
Aging--Europe.
Aging--Germany.
Older people--Europe.
Older people--Germany.
Older people--Health and hygiene--Europe.
Older people--Health and hygiene--Germany.
Retirement--Europe.
Retirement--Germany.
Princeton subject headings:
Health status indicators--Europe.
Health status indicators--Germany.
Middle-aged persons--Europe.
Middle-aged persons--Germany.
Older people--Europe.
Older people--Germany.
Quality of life--Europe.
Quality of life--Germany.
Retirement--Europe.
Retirement--Germany.
Social surveys--Europe.
Social surveys--Germany.