These data are from the US Social Security Administration.
M2014FAn object of class tbl_df (inherits from tbl, data.frame) with 120 rows and 5 columns.
pmort the probability of a person of the given age dying in 2014
nliving traces a hypothetical population of 100,000 people through the mortality at each age.
died for the hypothetical population the number of people at that age who
survived to the age and then died at that age.
Source: https://www.ssa.gov/oact/HistEst/PerLifeTables/2017/PerLifeTables2017.html