Currently you have to be six by the start of elementary school to enter without special permission. When I was in school you had to be six by December 31st of the year. So in the modern world, you are correct, he would be about dead center in age. In my world almost a year. Regardless he is not a young player by anyones sense of what it means in college play. Hell he is barely young by modern NBA standards, he will be 20 in a few weeks.