This is a retrospective chart review of perinatal outcomes of all primiparas over the age of 24 delivering at Maternity Center Associates, an out-of-hospital birth center, from January 1985 through May 1988 (N = 228). Chi-square analysis was used to determine whether mature primiparas, aged 35 to 43 (n = 27), had significantly more adverse outcomes than younger primiparas, aged 25 to 34 (n = 201). There was a significant difference between the groups in rate of transfer to hospital; however, there were no significant differences in rate of cesarean section, infant birth weight, apgar scores, and length of second stage labor. Implications for practice and future study are examined.