Mccaw Blue and Gold

Question
I will start with thank you for your time Rev. I have recently aquired a blue and gold mccaw from a very abusive household. I have several questions and I dnt expect you to get to all of them but whatever you can answer I would be grateful for. First how could i get a rough idea about his age? Is there any particular foods that could be harmful to him? Is there anything I can do to try and handle him without or atleast minimizing injury to me or him? He has alot of feathers missing is there anything i can do to help him stop plucking and itching? I made a cage for him it is about two and half feet wide three feet in lenght and three feet in height on a three foot stand with a makeshift perch inside and a bought perch outside would that be sufficient in size? Is there anything that I can do for him right away to make him more comfortable? With all that said a litte about me I have three dogs currently and two children the parrot "maxx" seems to get along with the dogs just fine he will eat out of my hand without biting me. He really acts like he wants to socialable but he has already made it clear that he will bite. I saved this bird and I refuse to part with him I have never owned a bird but he seems like he just needs some love. Thank you for your time.

Answer
I would love to see pics of your new rescue, a very lucky bird to have someone like you who's asking all the right questions.  
 I have each and every one of them answered at my site - including pics of my own rescues and ideas for perches that you can make yourself (I have no ulterior motives)

 When it comes to foods to absolutely avoid, probably the top of the list would be Avocado.  Of course no chocolate, no alcohol.

 There's really no way to tell age unless the bird is a year or less.  The younger the bird, the more black you'll see in their eyes.  As they get older the color becomes more clearly a blue-grey.

 With a very old bird a vet may find some arthritic changes, there may be some difficulty grasping a perch of certain widths or climbing as they used to.

 Also, a bird like this in a family with children under 12 years is a potentially dangerous mix, so since you haven't mentioned their ages, if they're under 12 it's very important to never, ever, let them be with the bird unsupervised, no matter how much you might think the bird is tame or trustworthy.
  Dogs, depending on their size and personalities may be more afraid of the bird - and perhaps actually hurt by him - than the bird victimized by the dogs; however, again, no matter how well everyone might seem to get along, just one mistake can be fatal to the bird or cause a costly injury to the dog.

 All warnings aside, take a look at my site for more about how to make this integration easier and more successful.  Then send me a pic and let me know how it's going.

 www.4AnimalCare.org  (click on the bird tab)