Frequencies for first 10,000 rows of ager variable in nhamcsopd2007 dataset :

       age recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   under 15 years |      1,759       17.59       17.59
      15-24 years |      1,264       12.64       30.23
      25-44 years |      2,528       25.28       55.51
      45-64 years |      2,925       29.25       84.76
      65-74 years |        777        7.77       92.53
75 years and over |        747        7.47      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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