My father was a bus driver and he had a heart attack in his late 50s. The number of men he worked with who also had heart attacks was staggering. When he visits

My father was a bus driver and he had a heart attack in his late 50s. The number of men he worked with who also had heart attacks was staggering. When he visits the hospital for his regular check-ups he always meets other bus drivers. It's really quite alarming.