Question: what is the average life expectancy on?
Answer: Worldwide, the average life expectancy at birth was 71 years (70 years for males and 72 years for females) over the period 2010–2015 according to United Nations World Population Prospects 2015 Revision, or 69 years (67 years for males and 71.1 years for females) for 2016 according to The World Factbook.