I've only bought started birds once, and they were 12 weeks old and did fine. What is an appropriate age to ship juveniles?
After reading a recent post where all three birds at 12 weeks died from stravation, I would have to say the younger the better. Day-olds still have the yolk sac attached and feed from that so they survive shipping better than older birds. And I just learned all that too from someone else's disaster.