According to the American College of Obstetricians and Gynecologists (ACOG), advanced maternal age has been defined as women who are 35 years or older at estimated date of delivery . The mean age of American women having their first birth in 2020 was 27.1 years compared with 21.4 years in 1970. Despite fertility rates dropping with age, many celebrities have been successful at childbirth far beyond age 35, mostly with the help of modern medicine. Celebs who had kids after 40: 1. Halle Berry- 41,