What specific finding demonstrates that length is not always a reliable proxy for the age of mature GTs?

Answer

A 137 cm FL fish was aged at only 13 years, while a 136 cm FL fish was aged at 25 years

Data showed significant variation, including one specimen measuring 137 cm fork length (FL) that was only 13 years old, contrasted with a slightly smaller fish (136 cm FL) that reached 25 years.

What specific finding demonstrates that length is not always a reliable proxy for the age of mature GTs?
animalfishlifespangiant trevally