I have two greys, my TAG I brought home fully weaned. My CAG was eating all kinds of food but still was eating evening formula. He was 5 months old. I spoon fed my CAG for two evenings and my TAG would finish up the remainder of the formula. My TAG was then 2 years old. After two evenings my CAG refused any formula. I live alone and my greys are bonded to me. I realize I did not formula feed them very much, not that's all I have. My TAG, Ana Grey, is almost 5 years old and my CAG, Sterling Gris (Fr. Grey) was 2 years old in March.