Depends on the breed. Some go longer than others. When the number of ducklings fall off. save a few of the best to be your future breeders. Frankly we found it useful to have a few grandma ducks around because first mothers Often don't have a clue about how to raise a duckling until Grandma steps in and shows her.arctally said:That's it, what age should I retire my breeder ducks? The oldest I have now is two.