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Age at birth of first child

Codes and Frequencies

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For female sample persons aged 18 and older who have ever had a live birth, BIRTHAG reports the person's age when her first child was born. Please see Comparability and Universe tabs for information on changes in the wording and universe between samples.


Changes in survey design (e.g., quarters in which the supplement was collected) may affect raw frequencies, but do not affect comparability of the variable. As always, data users should use the prescribed IPUMS NHIS weights.


  • 1987: Half of female sample adults age 18+ (excluded from CAEP supplement) who have ever given birth to liveborn infant.
  • 2000; 2005; 2010; 2015: Female sample adults age 18+ who ever had a live birth.


  • 1987, 2000, 2005, 2010, 2015