Frequencies for first 10,000 rows of ager variable in namcs2009 dataset :

       age recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   under 15 years |      2,109       21.09       21.09
      15-24 years |        793        7.93       29.02
      25-44 years |      1,934       19.34       48.36
      45-64 years |      2,900       29.00       77.36
      65-74 years |      1,088       10.88       88.24
75 years and over |      1,176       11.76      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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