Columbia subject headings:
Harvard subject headings:
Age--Social aspects--Congresses.
Aging--Social aspects--Congresses.
Aging--Social aspects--Germany--Congresses.
Old age--Social aspects--Congresses.
Older people--Congresses.
Princeton subject headings:
Age--Social aspects--Congresses.
Aging--Social aspects--Congresses.
Aging--Social aspects--Germany--Congresses.
Old age--Social aspects--Congresses.
Older people--Congresses.