Frequencies for first 10,000 rows of ager variable in nhamcsopd2004 dataset :

       age recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   under 15 years |      1,922       19.22       19.22
      15-24 years |      1,268       12.68       31.90
      25-44 years |      2,679       26.79       58.69
      45-64 years |      2,658       26.58       85.27
      65-74 years |        826        8.26       93.53
75 years and over |        647        6.47      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016