Surprised it's not higher than 12%.
Both my own father and FIL died in their 60s and both had led a healthy lifestyle, i.e. sport, exercise, no/little alcohol, non smokers, not overweight, yet both struck down in their 60s, one with cancer (a non lifestyle related cancer) and the other died suddenly with an aneurism (again, not lifestyle related).
One of my clients (again, healthy lifestyle) died after a blood clot in his leg moved to his heart causing a massive heart attack - no pre-existing conditions, fit and healthy etc.
There are lots of things that can "get you" despite living a fit and healthy lifestyle. Most cancers aren't lifestyle related yet all we hear are from the cancers that DO have lifestyle causes, i.e. smoking, sunbathing, overweight, etc!
My DH was struck down with another non lifestyle related cancer in his early 50s - he's still with us, but that's down to ongoing chemo drugs and infusions that control the disease as it's incurable, but we're under no misapprehension that he'll live to see his 70th birthday - we know he won't as his deterioration is clear and more and more things are going wrong with his body because of the cancer and the chemo. Prior to diagnosis, he was a healthy weight, never smoked nor taken drugs, very little alcohol (literally only a glass or two of wine per year!), playing golf, cycling, skiing, walking, etc.