Think back to your first day of school. The new shoes. The slightly-too-big backpack. That low hum of dread in your stomach, the one that asked: what if I sit in the wrong seat? Now imagine showing up to that first day at 90 years old. That’s exactly what Paul Hocheder did. And he didn’t have to. He already graduated from college once, back in 1960, after seven years in the military. The man earned…