>> A animal stunted like that would never make it to twenty one years old.
I agree that stunting is reprehensible and usually kills the animal, but I personally know of an alligator that was under 30" for more than twenty years. It was sold (illegally) at an Oklahoma pet store in 1974 or 1975. I remember really wanting it as a teenager, but not wanting to risk breaking the law (plus I couldn't afford the $50 asking price). Caimans were only about $5 back then.
It was purchased by a college student who kept it until he graduated and then donated it to the Biology department of the school and told them it was a caiman.
I first heard about it again back in the late 1980s. A recent graduate of the college told me of the "caiman" that was only about two feet long that had been there for years. I then heard from several other former students who remembered it.
During the 1990s the school built up a small herp collection and started buying feeders from me. Around 2000, the student who usually picked up the herp food wanted to try some alligator diet for the "caiman." I cautioned him that, in my experience, caimans were not nearly as good about eating the dry food as were the alligators. He tried it and the animal took to it right away. The only problem was that it soon started growing again and outgrew its 40 gallon tank.
At a later date they wanted me to come check out some new, larger cages they were constructing for the collection. I was interested to see the "caiman" I'd heard about over the years. Of course I was startled to see it was not a caiman at all. After talking to several of the older faculty members we were able to trace the animal's history back to the pet shop in the 70s.
The animal has continued to grow. I was able to find a local herp educator who offered to take it after clearing everything with wildlife department officials. It was getting too hard for the college folks to handle.
Again, my feeling is that no one should get any animal if they won't be able to allow it to grow to a healthy, normal adult size. But it is certainly possible for an animal to survive in a dwarfed condition for many years, and even to start growing again when diet and conditions improve.