Also scientists distinct between life expectancy and healthy life years. It is good to have as much healthy life years during your expected life span 
I am commuting by bike and uni every day and in the last 10 years I had to take off 10 days or so from work because feeling sick while the average in Germany is 11 days - every year. I credit that to my sports activity.
OK, I have to admit that 5 days were due to a sports injury, and also that your life expectancy (and therefore maybe also your healthy life years) will drop if you go extreme. But your odds are better if you do some sports, eat healthy and avoid tobacco and alcohol.
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