which is right??

i got this from a chat with a teacher recently.. here is the case.

this happen in a country where the law states that if a person reach the age of 16 he/she can make his own decisons without his/her parents consent

a boy which is 15 years old turning 16 in a few months had a heart disease that can be treated through a transplant. His parents found a suitable donar and he is fit for the tranplant. but he will not be able to wait till he is 16 years old for the transplant. The boy didn want the transplant because there is too much animal cruelty done. He say that its cruel that humans did this test on animals before doing them to humans. he insisted that rather die that go for the transplant. the boy understands his situation very well and he is quite mature. he is a very knowledgeable and he reads a lot. he is a vegetarian since the age of 2.

his parents was shock to hear it but since the boy is not 16 yet, they decided to go ahead with the transplant.

here is the problem:
is it ok that the parents use the law which states that they can make the decision for the boy??
or the boy can make his own decision to not take the transplant and die.
is the boy really mature enough to balance between right and wrong??