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Sorry this is off topic but boy to I wish my DYHA wasn't seasonally aggressive. We love him but boy does he get nasty. We don't know how old he is since he's from a parrot rescue but were told maybe around 7 or 8 years old. He never let us cuddle with him and freaks out if he even thinks you're going to touch him but will step up on your hand fine..
Males tend to taper-off in their seasonal aggressiveness after about 7-9 years of age. You can think of that window as being similar to peak "hormone-drive" time in teenage boys. If you want to know how old your bird is, you can try tracing his leg-band ID to the breeder by contacting L&M, the manufacturer of most parrot leg-bands. Their website is here:
http://www.lmbirdlegbands.com/
Contact them and ask for their leg-band tracing form. For a small fee, they will find the breeder who purchased the band on your bird, and reply to you with the breeder's contact information if the breeder chooses to disclose it.
My bird is unusual, as compared to other male amazons, so don't be upset that yours isn't like mine. Some factors contribute to this difference. First, I believe he has bonded to me as his mate. This has positive and negative consequences. On the downside, bonding to me as his mate means he treats anyone else as a threat to "our relationship" and is generally aggressive to them. When birds don't bond to a particular person as their mate, they will likely be more generalized in their affection to people (thus not as aggressive to others as Sammy is, but not as affectionate to anyone as well). This is a better situation when there are multiple people in a household. I live alone (aside from times when I've had roommates over the years, but even then, I was usually the only one interested in interacting with him, anyway), so having a bird bonded to me this way isn't much of a bother.
A second reason is probably because when I purchased him, I had to towel him three times a day to give him medicine to clear a mild infection he had at the time. He struggled and wasn't happy, but by the time his course of antibiotics was completed, I think he was "broken-in" and came to accept me. Behaviorally, his fear of me was extinguished because his struggles were ineffective at getting away from close contact. I also sought to include him in as many of my routines as possible, and rewarded his positive interactions (e.g. sitting near him while I ate, I'd give him a piece of my food when he came to me on his own, and food-sharing is a big deal to amazons).
He didn't turn snuggly immediately, but there was a sharp change from "being afraid" to "willing to be near me" in the course of medicating him. The snuggly part gradually evolved as he learned that it felt good to have his feet rubbed (amazons are big on foot stimulation), and then his belly and face, etc. A good time to increase contact is while your bird is molting and has itchy pin-feathers coming in on his head. They are more receptive to touch then because they can't reach those feathers themselves.
Try to interact with him the way amazons interact with each other. Amazons are rough and rowdy. I'm not advocating hitting a bird by any means, but when amazons interact with other amazons, they will frequently display open-beak threats, growl, lift a foot, etc. as a way to say "ok, enough." When interacting with him, if he starts being aggressive, try raising your hand with your pointer-finger extended to just above his head, open your mouth, and say something like "Hey! No!" If he motions as if to bite, quickly tap his upper beak with that finger, and repeat "Hey! No!" You will be communicating with him in a way he understands.
Also, remember that food is a big thing to amazons, and find what food is his favorite, then don't offer it in his cage. Save it for rewards for positive interaction. When moving near birds, remember that they are prey species, and have a natural aversion (for the most part) to fast, jerky movements. Try to be more fluid. Be observant of what makes him anxious and what doesn't. Amazons are very obvious in their body language.
My basic approach to animal interaction follows one main principle -- humans are the more intelligent species, so it is much more feasible for a human to learn how to behave like the animal than it is for the animal to behave like a human. Interact with your animals the way a "leader" or "dominant" individual of the same species would interact with them. Correct them the way another member of their species would correct them, and reward them with things that species would find rewarding. Use those principles to shape the animals' behaviors.
Good luck.