Actually, assuming near speed of light, he would still be about 8-10 years old due to time slowing down for him. 60 years would have passed for us and another 60 for us when the child had returned at about age 11-12.
If one could instantly accelerate to the speed of light and instantly decelerate to zero, a person could visit the entire universe, aging only when they are not travelling. Of course, they would have to say goodbye forever to everyone at any site they visited.
Assuming the theory of relativity is correct, time doesn’t pass when you are travelling at the speed of light, so from your perspective, you would arrive at each destination at the same moment you left the last one.