I'm surprised that people think making it to 55 is an achievement. My grandad smoke and drank his way up to 82, so I am sure my considerably healthier-than-his living will see me hit 90 (plus the advances of medicine).
Your Grandad probably ate a much healthier diet than we do today. A tomatoe today only has 1/7th of the Vitamin C and other nutrients than from one just 50 years ago because of GM engineering, toxic pesticides and industrial farming.