My last trip in a Tonka was at the ripe old age of 49, indeed I was on ops in Afghanistan on my 49th birthday. But I was far from the oldest to fly her, with some recently finished in their fifties. There may even still be some old fogies flying.
I'm not convinced quick reflexes or reactions are ever the secret to flying a FJ, more like common sense and an ability to deal calmly with rapidly changing scenarios. But that's not as funny as some of the other contributions.