Ok, I'm Ali, Captain is the name of my grey. If you could post a picture of your bird then it might be easier to tell if a bird is an adult or a juvenile, however, in the absence of a hatch certificate, it is nearly impossible to tell a bird if it's over a year old. If your bird's eyes are grayish black and her tail feathers have a tinge of black at the ends, then she is under one year of age, assuming that you have a Congo African grey and not a Timneh African grey.
But if she has got clear yellowish eyes and a cherry red tail without any blackish color in it, then it's an adult bird which could be anywhere between 2 and 20 years of age.
What are you feeding her? if it's the seed mix containing millet, canary seed, oats, wheat, barley, safflower, etc.etc. than a good measurement is 3 spoons full of any baby formula. This will roughly equals to about 40-50 grams of seed mix. On top of that, you can give her fruits and vegetables such as apples (without the seeds), oranges, papaya, almost all kinds of berries, etc.etc.
Please read these two threads carefully and if you have any queries, feel free to post your question here.
Food DOs and DON'Ts
http://theafricangreyparrot.com/forum/index.php/topic,5329.0.htmlBirdy Recipes
http://theafricangreyparrot.com/forum/index.php/topic,6535.0.html
