Answer:
There are only a few reliable methods that are statistcal pluses: Diet and Exercise, a healthy lifestyle meaning safe sex, no smoking and alcohol only in moderation, maintain an active mental state, avoid stress and be happy. Get immunizations, regular routine health care including an annual Dental exam and treatment. Live where the air is clean and free from automotive pollutants. Some studies also indicate that married people, religious people and pet owners have extended life spans. Wealth helps, if only to afford appropriate health care. The one factor that is not a matter or choice is genetics, people whose parents lived to a ripe old age tend to follow that trend. Avoid wars, plagues, pestilence, radioactive contamination and famine, all of which are detrimental to a long life span.