How Long Do Green Iguanas Live?
Green iguanas commonly live 15 to 20 years and sometimes beyond. Most captive ones do not, and the reason is the same one that fills rescues with them: nobody plans for the adult.
Published lifespan figures
| Figure | Value | Notes |
|---|---|---|
| Commonly published | 15-20 years | The usual captive range |
| Some individuals | Reported beyond 20 years | Records exist |
| Typical captive reality | Much shorter | Among the most surrendered reptiles |
Checked September 20, 2026 against the sources at the foot of this page. Where sources differ the range is shown rather than averaged.
What actually shortens it
Published lifespans describe well-kept animals. The gap between the figure above and what a green iguana actually lives is almost entirely husbandry, and these are the levers that matter most.
Metabolic bone disease
Green iguanas are the species most associated with metabolic bone disease, and it is why so many rescued adults have rubbery jaws and healed fractures. A fast-growing herbivore has a high calcium demand and no dietary D3 to fall back on, so inadequate UVB shows up faster and more visibly here than in almost any other pet lizard.
An enclosure that was never adequate
A six-foot arboreal herbivore needs a custom enclosure the size of a wardrobe or larger. Most green iguanas are housed in something far smaller for their entire lives, which is the defining welfare problem with the species.
Being rehomed once it outgrows the house
Green iguanas are surrendered in numbers no other pet lizard approaches, and most rescues stopped accepting them years ago. An adult that needs rehoming frequently cannot be, which makes this less a stressor than an endpoint.
Common questions
How long do green iguanas live?
Commonly 15 to 20 years in captivity, with some individuals reported beyond 20. Many captive iguanas fall well short of that.
Why do pet green iguanas die young?
Metabolic bone disease from inadequate UVB and calcium is the classic cause, followed by lifelong housing in enclosures far too small. Green iguanas are among the most surrendered reptiles in the world.
Are green iguanas good pets?
For most households, no. They need a custom room-scale enclosure, high UVB, high humidity and a strict herbivorous diet, and mature males can be genuinely aggressive seasonally.