It is considered that a person's life span is largely determined by the combined effects of genetics and environmental factors. Lifestyle choices, particularly diet, exercise and smoking habits, play an undisputed role in determining not only how long one will live, but also how well one ages.
Some studies suggest that the life span only in 22-30% is
acconted for by genetic factors https://www.scientificamerican.com/article/genetic-factors-associated-with-increased-longevity-identified/, http://demogr.mpg.de/publications%5Cfiles%5C2942_1202133488_1_fulltext.pdf
Swedish study finds claims lifestyle
affects life expectancy more than genetics https://www.sciencedaily.com/releases/2011/02/110207112539.htm. However, some recent studies
indicate that genes are more important than lifestyle for longetivity https://www.scientificamerican.com/article/genetic-factors-associated-with-increased-longevity-identified/
8.5 percent of people worldwide (617 million) are aged 65 and over. According to a new report, “An Aging
World: 2015” https://www.census.gov/content/dam/Census/library/publications/2016/demo/p95-16-1.pdf this percentage is projected to
jump to nearly 17 percent of the world's population
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