Humans are getting old. They live on average for 32 years in Swaziland and 83 years in Japan. Average life expectancy has grown from around 26 years in the Bronze Age to 48 years in 1955 and 67 years in 2010 and is expected to reach 73 years in 2025.
Share of elderly people (over 65 years old) has already exceeded 15% of population in most developed countries. In Germany, Italy and Japan, the proportion of elderly has increased over 20%, for example while the world's average is estimated at nearly 8%.
According to the OECD, future decades will bring an extremely rapid rise in the coming years of the number of elderly and very elderly – estimated for example for Europe at 37% and 54% respectively by 2030 (and 44% and 171% respectively by 2050).
Find more data at Population over 65 years.