http://awesci.com/crocodiles-do-not-die/

Crocodiles have no such thing as old age. A 7-year-old crocodile is as good as a 70-year-old one in terms of agility and other life parameters. Aging has no effect on them. Although they can’t die of natural aging, they also can’t live forever. Nature has a way of killing them. The way they die is out of starvation or if they contract a disease.

They keep growing throughout their lifespan and they require more and more food. So, as they keep getting older they need a lot more food. When that amount of food is unavailable, they die from starvation. That is the reason we don’t see 1000 year old crocodiles that are 50 feet long. Still, see what this hunter shot in Australia in the year 1957 – It was an 8.1 m (28 feet) long crocodile!

https://www.quora.com/Are-crocodiles-biologically-immortal

New research at Yale has provided strong evidence that recombiant DNA combined with symbiotic bacteria allow for immortality of crocodiles. Experiments with accelerated aging have shown that crocodiles show no appreciable signs of mortality at effective ages of over 2000 years.

http://biology.stackexchange.com/questions/5203/do-crocodiles-age

Do Crocodilians undergo senescence (show signs of aging)? Well, if this study from "Gerontology" written by Patnaik BK in 1994 is to believed... Maybe not.

Evidences and mechanisms of rapid or negligible senescence in reptiles are still fragmentary and unclear... neither the increase in mortality rate and accumulation of lipofuscin nor the reproductive senility have been shown conclusively in ageing reptile populations.

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30649053)

"illegal immigrants have been saying I treat them too harshly with my deportation policies. you know what? that's a crock! they want a crock, i'll give 'em one!"

*yanks curtain*

*crowd screams and stampedes*

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30649136)

So zoo crocs are gonna grow to be 30 feet +?

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30649149)

You: experience age discrimination at 40. killself at 45.

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30652662)

40? try like 33.

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30652890)

Seems that adjusting human DNA to make perfect copies (or even more perfect) copies each time (but halting growth) is not that far away.

They probably can do it now. 90% certain Elon Musk has people working on this now.

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#30652888)

Aging is mostly the result of epigenetic changes to the genome. They can see this through the generation of induced pluripotent stem cells. The epigenetic clock can be reset and old cells end up looking almost exactly like young ones. Aging is either programmed or the result of a process like antagonistic pleiotropy, where developmental genes eventually cause cellular dysfunction.

(http://www.autoadmit.com/thread.php?thread_id=3246939&forum_id=2#34549548)