Can an adult's heart be transplanted into a child? Assuming the transplant goes smoothy and the recipient's body doesn't reject the new part, how soon after the transplant can the recipient resume normal activities? What kind of everyday activites most people take for granted are off-limits to heart transplant patients?
I know this depends on all kinds of things, so for the sake of these questions, the recipient is man in his early twenties. Because of a defect in his heart, he had a transplant about 10-12 years before the story takes place.