I recently received four cockatiels, all housed in one cage together. One pair is about 14 years old, so I wasn't expecting much from them. The other is about 7 years old. Or so I've been told, anyway. I wanted to split up the pairs because the cage wasn't all that big, and the younger female has had her entire crest plucked. The younger male acts dominate, but his head has been plucked behind the crest. Unfortunately, before I could purchase a second cage, the younger male and OLDER female seem to have paired up and she has now laid an egg. It was in the bottom of the cage, so I quickly cut a hole in a cardboard box and put it in the cage and moved the egg in. They took to it immediately. However, 48 hours has passed, and she has not laid another egg. Yet as of this evening, she appears to be brooding (sleeping in the box with the egg). Can she really be laying eggs at 14 years old? Or is she likely much younger? I know there is a good chance it is fertile, because I actually caught the younger male mounted on her earlier that day. And if she is still capable of breeding at that age, should I now assume the one egg to be all she'll lay? I read that they should lay about once every 48 hours - even after she starts brooding. But she's pushing 72 hours now.