We tend to picture Isaac as a child when Abraham is told to sacrifice him, but much of the Jewish commentary says that Isaac is a 37 year old man by this time, and that the story is as much about Isaac’s willingness to obey his father as his fathers obedience to God.
The Midrash contains a story that says Isaac, in his desire to be obedient, asked his father to also tie his hands and feet, because the urge to break free and escape death was so strong.