How much has life expectancy grown since 1960 ?
The UN itself mentioned that gaps in life expectancy so far in the future may well not exist , especially since the exchange of technology between rich and poor countries and the industrialization and development of poor countries may cause their life expectancies to converge fully with those of rich countries long before that point , similarly to the way life expectancies between rich and poor countries have already been converging over the last 60 years as better medicine , technology , and living conditions became accessible to many people in poor countries .