i would do a vet checkup with a reptile vet twice a year maybe for blood work and to make sure your iguana is healthy ,
they could probley give you a estamte about your iguanas age but probley not like the right age depending on the iguana and how they are taken care of wise they only can geuss ,
i adopted my iguana they told me shes 3 1/2 years old and shes only about 3-4 feet shes not very big but her adittude dilotes that alot lol

good luck

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