At what age do baby cockatiels normally wean? The babys new owner wants to know how much longer....I kinda would like to have an answer for her.

Usually at 8 to 10 weeks. Some will take a little more, some a little less. So you get to keep your babies for another month! It's best to keep them for a few extra days after you notice the parents aren't feeding them any more to make sure they're solidly weaned. Going to a new home is stressful and a just-weaned baby might regress.