Aging: from Demography to Epidemiology
Aging of the worldwide population is progressively increasing, in relation to augmented life expectancy (LE), which in 2016 was around 71.4 years according to the World Health Organization (WHO), with a greater expectation in women than men all over the world . Today, for the first time in history, even in less developed countries, most people can expect to live for more than 60 years, especially because of the reduction in childhood mortality , while in high-income countries, it is mainly due to the increase in life expectancy of over 60-year-old individuals [3, 4]. Currently, it has been estimated that life expectancy of 60-year-old people rose from 18.7 years in 2000 to 20.4 years in 2015, with different regional rates. In particular, 12 European countries, including Italy, in 2015 showed a life expectancy that exceeded 82 years of age, with women living longer than men in every part of the world . In 2016, WHO data underlined that LE was 73.8 years for women and 69.1 years for men, quite similar to 2015 data .
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