Really, what choice do you have?
You're only going to get older, and the time will pass no matter what you do or don't do.
Heart, drive, desire, motivation, attitude, whatever you want to call it, is what's important in most anything you do. Just go and do it. I started a year ago at 57.
You're aware that the younger he starts, the more butts full of sand he will have to deal with, correct?