C.S.
Some kids just have a strong bladder and can hold it longer. If he's not complaining of discomfort he's probably ok. I have twin 4 year olds, AJ and Eli. Eli has to pee before we leave the house, when we get there, and before we leave to come home. AJ will not pee before we leave, hold it the whole time we're out and still not go when we get back. But when AJ does go, watch out! You would think an adult is using the toilet, LOL :)