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In page Demography:

"
  • The expectation of life (or life expectancy), the number of years that an individual at a given age could expect to live at present mortality levels.[citation needed]
  • The total fertility rate, the number of live births per woman completing her reproductive life, if her childbearing at each age reflected current age-specific fertility rates.[citation needed]
  • The replacement level fertility, the average number of children women must have to replace the population for the next generation. For example, the replacement level fertility in the US is 2.11.[1]