It’s not an easy role, because it requires playing different ages from childhood through age 43, so you’re going to have to get a child actor who looks like the adult Henry, and then you need someone who can convincingly play ages from 20s through 40s. He’s supposed to be good looking, have dark hair and be thin but athletic (an obsessively good runner who can also beat people up when called upon to do so). The only person that immediately leaps to mind is Brad Pitt, but he’s the wrong coloring.