How old was sir Walter Raleigh when he discovered North Carolina?

He did not discover North Carolina. He and others sponsored and organized two voyages to Roanoke Island in what is now North Carolina. These were in 1584 and 1585. In 1587 a third voyage took place but Ralegh had little to do with that expedition. The 1587 colony became known as "the lost colony". Ralegh did not accompany any of the voyages. He never came to Roanoke Island.