Expect a long-lived animal: 15 to 20 years is the typical span for a green iguana in good care, and the number only tells half the story. The other half is size, because the thumb-length hatchling in a shop tank grows steadily into a heavy, powerful adult with a long tail, and its housing, diet, and handling all have to grow with it. Many iguanas fall short of a full span not through any single crisis but through years of a diet or enclosure that never quite suited an adult. Planning for the adult animal from the first day is what gives the lifespan a chance.
A Leafy Diet, Every Day, for Years
Green iguanas are herbivores, and their long-term health rests on a daily diet built from leafy greens, with other vegetables and a little fruit making up the smaller share. The staple should be proper dark leafy greens rather than watery salad leaves, chopped and offered fresh each day in a portion matched to the animal's size. Animal protein does not belong in the routine diet, however eagerly a young iguana may take it, because a protein-heavy diet works against kidney health over a long life. Variety across the week matters, since no single green covers everything, and a calcium-rich balance of greens is the quiet foundation of bone health in an animal that keeps growing for years. An iguana that eats a varied leafy diet, basks well, and stays active is stacking the years in its favor.
Light, Humidity, and Room to Climb
An adult iguana needs an enclosure measured in feet of floor space and height, with sturdy branches for climbing, a warm basking area, and a cooler retreat. Ultraviolet light is not decoration for this species: proper UVB lighting, replaced on the maker's schedule as its output fades, supports the calcium use that keeps bones strong, and an iguana kept for years under weak or expired lighting pays for it slowly. Humidity needs to stay reliably in a comfortable range, supported by misting or a humidifier and a water dish large enough for soaking, which helps shedding and hydration. Handling should stay calm and predictable, with the animal supported fully and never grabbed by the tail, and household members who interact with the iguana should all use the same approach so a large lizard stays manageable and unstressed.
Planning for Two Decades of Care
An animal that may need care for 15 to 20 years will outlast many household arrangements, so its care cannot rest on one person's memory or availability. Write the routine down in full: the daily salad mix, misting, basking temperatures, lighting replacement notes, and the handling approach everyone follows. When several people share feeding and cleaning, each person should work from those same notes, because an iguana fed by guesswork from three directions gets inconsistent portions and missed enclosure care. Review the plan as the animal grows, since the enclosure, portion sizes, and handling all change between hatchling and adult. Relatives an owner picks may be given access to its profile, and giving that access is the part played by KinsLe Family Sharing.