I came into the game very, very late. It was rather odd, in a way. I spent a good deal of one year when I was in my early fifties worrying about some very strange and ominous symptoms that I had, which also disturbed my doctor, enough that he made appointments for me to be checked over first by a rheumatologist and then by a neurologist. They were investigating the possibility that I had an incurable and invariably fatal neuromuscular disease, one which my father in law was dying of during that same period. I had a passing thought at one point during that period that if it turned out all right, then I would start studying some martial art... not sure where the thought came from, but there it was, and it persisted. After waiting several months to see the neurologist and then have a followup EMG, I learned that I was fine, and I remember that one of my first thoughts was, now I need to find a MA to study.
Very soon after that we learned that there would be a TKD class offered at a nearby rec center, and that many kids from our son's elementary school were going to be taking the class, including a number of his friends at the time, so it seemed reasonable to sign him up. I took him there for a couple of months and stayed to watch, and it looked very good to me—I'd had a hard, linear approach in mind—so I joined the class... and that was that!