This is a very fair question. I became interested in the possibility after learning about research coming from the Medical Center and University in Loma Linda, California, my Blue Zone neighbor made famous by Bill Butner in his books and Netflix series. I have discussed these findings elsewhere and won't repeat the results here. The evidence for living an extra decade, beyond average life expectancy is quite possible with those who practice the health principles of the Seventh Day Adventists. I also believe the general population can adopt some of these lifestyle habits and share the longevity benefits.
I have made living an extra decade my personal goal and work on reaching this goal each day for a number of hours. Will it work? Who knows? When asked that question I always repeat the same response. Doing nothing to improve lifestyle characteristics will result in no change from the status quo.
It is important to also accept reality. A lot depends on our current health condition, age, and some good luck. Genetics plays a role too, but many scientists suggest it controls only 20% of the formula for longevity. That gives us 80% to manipulate in our favor. I believe that any contribution we can make toward a more healthful lifestyle may result in a longer life, whether adding days, months, or years is unknown and will remain so until the end. I believe the effort we invest will result in commensurate benefits. I'm committed to making a good shot at it. I hope you can join me and others on the journey to a longer, healthier, and happier life.