He would never be able to speak in sentences or graduate from High School. He would never marry nor have children. That was transformational for him. The script of life does not read that all will go well for us - especially if we are good people. The script of life reads that life is uncontrollable and sometimes cruel.
Unexpected things can and do happen - to everyone.
What is at issue is how are we going to deal with what comes our way. I know that such a line of reasoning is troubling for some. They argue that God makes these things happen or allows them to happen to teach us something. And yes, we can and do learn in all things. My guess would be not much.