But what I didn't hear mentioned is that women have a much lower risk for heart attacks until menopause. And I don't know that I've ever seen a 55 year old woman shoveling snow (again, anecdata). If you strapping young lads were raised right, you'd go down and do it for her since you already have the shovel out. :-)
More so, shoveling snow is amazingly hard work on a level that most people probably rarely experience. I'm a lifelong distance runner with a healthy heart (though weeny little runner arms), and shoveling sure gets my heart going. I can't imagine the strain on a 54 year old guy with a beer gut who spends most of his day sitting. That does sound like a recipe for a heart attack.