my oldest is a late bloomer. He had the peach fuzz all through middle school and it didn't start to thicken or get darker until last year I think. He's 17 now, will turn 18 in October. He did go to school with a kid, who in 6th grade had a full blown beard.
Middle son is the same way, he has the light peach fuzz on the corners of his mouth now, he just turned 14 in January. He also still has some baby teeth.