at what age do miligold macaws start eating?

All parrots wean at their own pace, and it's very important not to rush them. Two months is WAY early to start trying to wean him. I don't recommend even trying until at least four months of age, and even then he may be five to seven months of age before he really starts eating hard foods.

Also make yourself aware of the weaning process. It's not like you can just one day stop giving him formula and make him eat solid foods. Please do your research on hand feeding- this is something you should have been aware of beforehand.

http://www.companionparrot.com/young%20&%20weaning.htm Here's a good place to start reading. It has some good links to articles on the subject.