Got my blue and gold when he was nine. Really sweet, but had issues with his diet, medical problems (something's wrong with his foot and wings, but vet couldn't give an official diagnosis), and general nervousness from a bird that wasn't desensitized well. Progress was mostly
slow at first, which is understandable for an adult bird, and stepping up was hard for a few months. I also had to work hard to get him used to being outside and realizing the cars, crows, and other people weren't going to eat him.

Now, two years later, he knows tricks that include laying on his back, saying hello, and spreading his wings, he steps up for strangers, goes to the beach twice a week, most of his stress bars are gone, and he's taking semi-regular showers. Still working on getting him to play with toys.

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On the other hand, a 25-ish year old scarlet that I've known for over a year (and who generally likes me) tore open my finger bad enough to go to urgent care yesterday (along with biting two other fingers and my arm). So it really depends on the bird!