The average number of years that a person may expect to live has substantially increased over the past 25 years. Also, the life expectancy of a person now is 25 years longer than it was 100 years ago. Decreased infant mortality, improved living conditions, reductions in poverty levels and gains in medical treatment have resulted in increased longevity for humankind, benefiting a broad spectrum of people of all race, gender and ethnicity. https://www.brookings.edu/research/the-changing-landscape-of-american-life-expectancy/.
Reviewing records starting with the 20th century discloses that the world is seeing fewer deaths at older and older ages. The National Institute on Aging report puts this in stark terms: “The 85-and-over population is projected to increase 351 percent between 2010 and 2050, compared to a 188 percent increase for the population aged 65 or older and a 22 percent increase for the population under age 65.”
According to Thomas Perls, a geriatrician at Boston Medical Center and professor at Boston University School of Medicine, “Getting to about 110 is really approaching the limit of the human lifespan,” and the oldest documented human life is 120 years. http://www.businessinsider.com/how-has-life-expectancy-changed-throughout-history-2015-6