According to the Global Health Observatory (GHO) of the World Health Organization (WHO), 70 years was the average life expectancy in 2012. In developing countries such as Brazil, there has been a rapid increase in life expectancy in recent decades and data have shown that it has doubled in the past century. It is estimated that 25% of the population will be over the age of 60 years by 2025, compared to 8.6% in 2000 and 4% in 1950 .