Corey's response: "While the paper doesn't support the two years to maturity (which I think they are pulling from related species), it's definitely at 1 year. The 4-7 years is probably pulled off captive specimens, and is feasible given a 2-3 year life span in the wild... their relatives may live longer, and given other conditions they may live longer, but in their super selective niche in the wild they don't :/".