This is how this particular author did it.
Kyle was no pushover to be sure, standing at 5?11 and weighing around 160lbs, he could handle himself, he had too. Three paragraphs later; Kyle was a good looking kid, his light brown hair, blue eyes and a face that belonged in teen magazines on top of the fact that he had kept in very good shape over the years playing sports, kept more than a few eyes on him.
For the protagnist he has this; Martin was a good 6 inches smaller than Kyle and was out weighed by maybe 40lbs; which is basically the only description.
This is what we know about the ages. The biggest rivalry in the area wasn?t on the football field or between the baskets, it was in the 10th grade class.