Many years ago I had read a Book concerning the Riders of the Tour, in this it said their average lifespan was 56yrs, I was shocked by this until I realised an overworked engine has to fail some day.
As for myself I have led a fairly sedentary lifestyle, on lots of occasions the Rev Counter has briefly touched into the red (having done a fair but of Sh@gging in my time much of that done in my late 50's) sure glad I never did take up Cycling as a sport.
Now in my 71st year and having no requirement for Viagra, I think this healthy living is much too over rated, of course this may be down to my Scottish diet, Haggis or deep fried Mars bars with the complimentary Glasgow Salad (Chips) then washed down with copious amounts of Guinness it sure does put lead in your pencil.