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. For example, the "Dalek Generation" was 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)