A doddering of seniors
A twaddle of Democrats
A condescension of reporters
A kegger of collegians
A trust-fund of peace marchers
A hypervapidity of Maureen Dowds
A gesticulation of Italians
A corruption of Congressmen
A moustache of policemen
A tumescence of pornstars
A shriek of liberals
A waddle of Rosie O'Donnells
A crimewave of Kennedys
A tapper of Idaho Senators
A nattering of elderly ladies
A caring of staff nurses
A nextplease of dental nurses
Octogenarians.
A group of people descended from the same ancestor is a family or a bunch of relatives. Sometimes, if more organized, they may be called a clan or a tribe.
A sociologist would refer to two or more people who identify or interact with one another as a "social group." This term encompasses various types of relationships, from casual acquaintances to close-knit communities.
Ethnic group.
Social psychologists refer to the process of making people in an out-group responsible for the problems of people in the in-group as "scapegoating." This phenomenon involves blaming and targeting an out-group as the source of issues or challenges faced by the in-group, which can lead to prejudice and discrimination. Scapegoating serves to maintain social cohesion within the in-group by shifting blame onto others.
A compendium
A group of people call the socs.
pee
A septet.
Genocide
The audience.
A group, crowd,
blassyem
Mob
You could call it a mixed group with varying interests or a diverse group with different priorities.
A 'demographic'
Pianists.