C-14 Dating can only tell us how long ago a living organism died - not its age at the time of death.
Regards,
I think it can be done. We have cemeteries full of bodies that were buried around the same time, which can provide a basis for what we would expect C-14 levels to be for someone who died at the time he did. If he is older than the control skeletons, he would have more C-14 in his bones, because it accumulates as long as you are alive and eating. Oddly, this might result in his skeleton seeming far younger than the controls, as it may appear he his C-14 hasn't had the time to decay yet, not that he had more of it. But if he has the same amount as the control skeletons, then he did not live longer than the others.