I was super-fit - so why did I have a stroke at 35?

I was super fit at 50, Why did I have a stroke? Because my Dads' doctor did not tell him to have his children tested for blocked carotids when he was found to have 80% blockage. This notification should have rolled out to every cardiologist in the world, so it wouldn't happen again. So cardiologists seem to be as bad as neurologists in not talking to each other or have protocols to update.

I was super-fit - so why did I have a stroke at 35?