If you want to live to be 100 or more years old:

 You have to start listening to what your doctors tell you. My cousin recently was telling me I had to shut out the anti-doctor rhetoric of my father and grandfather. He is now 80 years old and his wife is 81. But, he is also a very successful lawyer and has learned not to listen in his mind to the anti-doctor rhetoric of my father (his uncle) and my grandfather (his grandfather) too.

It has been hard when I had to watch my father and one of my best friends (and one of my best men at my wedding in 1995 die earlier than they needed to because they didn't believe in doctors either.

My father died at 69 in 1985 mostly because he didn't have his prostate removed when he was diagnosed with cancer in 1980. Instead he had his bladder, prostate, and one kidney removed in 1984 one year before he died of bone cancer which is what happens if you don't deal with cancer immediately because it often metasticizes into another form in your body and then eventually takes you out. 

In 1995 my aunt got a melanoma and it metasticized into her intestines and took her out within a year or two so I 've gone to dermatologists ever since to protect myself from skin cancer ever since. But, so far I haven't had a melanoma but have had many pre-cancers basil cell or squamish cell frozen off or surgically removed since then in 1995.

So, in a sense my father dying in 1985 at 69 and my aunt dying of a melanoma in 1995 have both vastly increased my own lifespan. If you can learn through the mistakes of others in addition to your own it vastly increases (Potentially) your own lifespan.

Something to think about.