Well guess I was not the oldest to start (thanks Donutz), but I did wait until I was 50. Had a pacemaker installed a week before turning 50 and went boarding for the first time two weeks later. My boy saw me ski, which I started at 48 and had about 6 days in and he just shook his head and stated it was time to switch.
Now twelve seasons, three boards and another pacemaker later (hey batteries do wear out), I go all the time and my boy hardly gets out.
Expect the unexpected and then deal with it.