My son rode a hybrid for quite a while and then wanted something faster. The hybrid pretty much kept him sitting upright. I took him out to try a few bikes more for size than brand. He's always been pretty good about knowing what "feels" right. He decided to wait because he could not comfortably reach the brake levers, even though everything else was okay. About 7 months later he was ready and we found a bike, he had grown enough that he did not need the frame size we originally looked at either. He is a bit shorter than me, but rides a slightly larger frame.

So, yes, take him with you so he try some out and get a feel for a road bike.