Generation

A generation was a group of people born around the same time, and thus living in roughly the same age group in the same time period.

The "Dalek Generation" was a name used to describe the people born during the Second Dalek War, who didn't know what it was like to live in a time of peace. (PROSE: Prisoner of the Daleks).

The Fifth Doctor speculated that a generation was every twenty-five years. (TV: Four to Doomsday)

The Fourth Doctor claimed that for a thousand generations, the name "Dalek" would spread fear and terror across the universe. (TV: Genesis of the Daleks)

The Disciples of Omega took four generations to install the transduction barriers on Gallifrey. (AUDIO: Renaissance)