"Living Healthy Without Killing Myself"

1) Accept that death will happen--basically, you're doomed.
2) Try living unhealthy and see what happens.
3) Know that if anyone really had the answer to your conundrum s/he would be over 150 years old and making billions daily selling a full-refund health plan payable at the age of 130 years to all those who have proof of birth with date, etc., and are willing to say they followed the plan assiduously.

If I think of other helpful options I will post them on this thread.