He's not too old and he doesn't 'hate you'.
Firstly, forget 'taming'---parrots of all sizes are wild animals. What you are looking to build is a mutual relationship that this positive and enjoyable for both of you.
It took about 2 years for my rescued grey (who was somewhere between 5-10 years old at the time when she came into my life) to actually really like me at all. Nearly 13 years later we are inseparable. You know what really helped me? Reading. Reading everything there was about clicker training, positive reinforcement and applied behaviour analysis. Barbara Heidenreich, Dr. Susan Friedman and Ann Castro's 'the bird school' were invaluable resources. I've taken courses, classes, attended seminars and I'm always looking to expand my knowledge. I've never lived with a cockatoo but I've been a member of 'mytoos' for a looong time. Why? Because it takes a lot of patience, skills and persistence to work with cockatoos and keep them healthy and happy---if I learn from the people who do it every day then it will help me work with my grey because it would be a mistake to assume that she would be 'easier' simply by being a different species.
Every bird is an individual and sometimes even the best researched 'step-by-step' plan doesn't work and you need to have knowledge and skills to be flexible, receptive to the bird and come up with something that works for that bird.
Ask yourself 'what is he communicating to me?' and 'what is he getting out of this?'
Thus far he is not comfortable with your hands close to him. That is why he bites. He has learned somewhere along the way that humans (either you or other people) will not respect (or even notice) his subtle communication of 'No! I don't like that! I'm scared!' and that the only thing is that (very stressful to him) last resort communication of biting. For right now, just slow down. He is clearly telling you that you have become (however unintentionally) a sort of negative experience for him. Step back and show him that you can be fun and positive for him. That you are worth engaging with and can be pleasant for him. You really have to sell yourself as a friend to this bird.
Parrots are not people of course, but in a lot of ways the rules apply to all creatures that we would apply to ourselves. Think about making a new human friend, how would you do it? Would you want to be friends with someone who had no social skills and kept making you very uncomfortable and making things awkward? How happy would you be to see a person who only responded to the most obvious negative communication (like you yelling at them and telling them to leave you alone or having to push or hit them to get them out of your face/for them to stop touching you)?
Slow down, breathe, take it one day at a time.
if I'm lucky lol. I've had him nearly 4 months now.
