Apr 5, 2023 · The average length is 18 inches but the largemouth bass may attain a length of 24 inches or more. The world record largemouth bass was caught in Montgomery Lake, Georgia in 1932. The fish weighed 22 pounds, 4 ounces (10.09 kg). Females may reach a maximum age of 9 years, while the males reach a maximum of 6 years.