First there are several kinds of longevity. Most or many zoos and some private collectors did what I can non functional longevity. Which is keeping reptile at the low end of its range of metabolism and feeding a few times a year. The animals actually do not grow to average size, much less full size. Personally I would fine them for that. A long lifeless life. Hmmmm not so good.
Functional longevity is with individuals animals that were kept in a way, they grew well, reproduced well and did so most of their life.
The original Albino Cal king lived to 35. He fathered a few offspring, hahahahahahaha I did not receive him until he was old and could not even crawl normally and could barely see, cataracts. He was middle twenties, then produced a world full of offspring.
Most of my females double clutched until 16 to 18 years of age, then single clutched for another bunch of years, then missed a year once in a while. So your male, hes a teenager.
Oh and the pair of gilas I have been watching for 35 years and they were normal adults, like they are now, then.
Also, longevity is based on our care, not what works, but what works well, like proper nesting, feeding, temps and not making friggin mistakes, as mistakes are the problem. Not so much the snakes ability.
The truth is, your animal is a reflection of your care. If you have done well, he will have many many more years of studlyism.

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