Here are some interesting findings about deaths among people below retirement age. A remarkable 55 percent of deaths for people ages 15 to 64 can be attributed to personal choices - things like smoking, overeating, or unsafe sex. That's a vast difference from a century ago, when a scant 5% of deaths were brought on by personal decisions (infectious diseases accounted for most of the rest). It really is important to pay attention to the choices you make about caring for your body.