what is average lifespan of a human
Worldwide, the average life expectancy at birth was 71.0 years (68.5 years for males and 73.5 years for females) over the period 2010â2013 according to United Nations World Population Prospects 2012 Revision, or 70.7 years (68.2 years for males and 73.2 years for females) for 2009 according to The World Factbook.ethodology [edit]. Life expectancy equals the average number of years a person born in a given country would live if mortality rates at each age were to remain constant in the future.