Bull sharks reach maturity depending on where they are. One study in the southern Gulf of Mexico found that the age of maturity was 10 years (7 feet) for females and 9–10 years (6.2-6.6 feet) for males. Another study in the northern Gulf of Mexico showed that the age of maturity was 7 feet (14–15 years) for males and 7.4 feet (18 years) for females.