When I was waiting for confirmation of my knee replacement about 12 years ago, the surgeon/specialist asked me why I wanted the knee replacing so early (I was 43 at the time and it was utterly shot to bits) as I would most likely need the replacement replacing at some point in the future.In Field of Dreams when Kevin Costner plays baseball with his dad - always gets me as my dad died when I was young so it is a most poignant scene
I told him I wanted to play cricket in the same team as my son the same way I did with my Dad, and how much it meant to me at the time, and how much I hoped it would mean to my lad, to be able to do that.
Got a new knee 6 months later and about 18 months after that me and the boy walked onto the pitch together, not just as Father and son, but as teammates. One of the proudest days of my life.