I've had my cockatoo since she was a baby, but my macaw is only 6. It's actually not advised to have cockatoos and macaws together (old and new world parrots) because the powder down can be very harmful to macaws and other new world parrots. I think that blue and golds are particularly vulnerable. I didn't know this when I got mine (a green wing). They're across from each other in a large room, and I try to shower both of them frequently and change cage papers and vacuum often to keep the dust down. I also have an air purifier, but I know I should run it more than I do (it's a bit noisy). So don't feel as if you need to introduce them - it's probably for the best that they not spend time together. And the cockatoo will be at a huge disadvantage as far as size and strength go. I never intentionally put them together, but sometimes my macaw tries to visit my cockatoo, and it really makes her angry!! I can also see that the energy level of the cockatoo can be a bit overwhelming for the macaw.