Warhammer crews replace themselves across generations

Warhammer battleships are imagined with enough people aboard to maintain a stable population over hundreds or thousands of years. A crew containing men and women can replace losses through later generations instead of relying entirely on recruitment at each port. That arrangement can also produce far more inhabitants than the ship needs if it avoids combat for several centuries. The discussion describes transferring part of an existing battleship's population into a newly commissioned vessel. The joke about waiting twenty years after the transfer depends on the unusually long service lives and planning horizons of the fictional fleet.