BACKGROUND: It has been hypothesized that factors of female reproductive history, including age at first birth (AFB), age at menarche and number of pregnancies, could have an impact on women?s health, including lung function. However, few studies have investigated the relationship between respiratory muscle pressures (RMP) and maternal AFB. AIM: To compare the means of maximal inspiratory and expiratory pressures (MIP/MEP) considering the AFB of middle-aged and older women living in the community of Temuco ? Chile and Santa Cruz ? Brazil.  METHODS: Women aged between 41-80 years-old, residents of the community of Temuco ? Chile and Santa Cruz - Brazil, were included in the sample. They were divided into two groups regarding their AFB (<18 years old; ?18 years old). MRP were evaluated through a digital manometer. We conducted the Independent Samples t test to compare MIP/MEP means considering both AFB groups. RESULTS: In this cross-sectional study, 85 women comprised the sample (mean age= 60.6; SD=9.2). A total of 40 women (47.1%)  presented AFB < 18 years, which showed a mean MIP value of 93.2 cmH2O (SD 7.2). When compared the means between both groups, the one with AFB < 18 years showed lower significant values for MEP: 97.9 cmH2O (SD 7.3) compared to 125.4 cmH2O (SD 6.5) for the group of AFB ?18 years old (p< 0.05). CONCLUSION: There is a relationship between MRP and AFB, once the younger the AFB, the lower the respiratory pressures among middle-aged and older women living in the community of Temuco ? Chile and Santa Cruz-Brazil.