Columbia subject headings:
Harvard subject headings:
Aging--Austria--Congresses.
Aging--China--Congresses.
Older people--Austria--Social conditions--Congresses.
Older people--China--Social conditions--Congresses.
Princeton subject headings:
Aging--Austria--Congresses.
Aging--China--Congresses.
Older people--Austria--Social conditions--Congresses.
Older people--China--Social conditions--Congresses.