Alligator Gars are known for their large size and alligator-like appearance. These gars can grow to be over 8 feet long and weigh over 300 pounds. Alligator Gars also have a relatively long life span. Like other species of gar, the female outlives the male. Female gars have a life span of 80 years while male gars can live up to 50 years. The oldest known Alligator Gar was estimated to be about 95 years old!