Animal Age, Lifespan & Life Stage Calculator

Explore sourced age, life stage, lifespan and sexual maturity information for cats, dogs, birds, small mammals and goldfish.

80 species and species groups; unsupported human-year conversions and breeding ages are not fabricated.

Choose an animal

🌍 Native origins and habitat

Wild climate is not the same as a safe enclosure temperature. A species group never implies one universal temperature.

Native range / origin

Natural habitat

Climate & temperature considerations

Ecology / care source ↗80-entry species atlas

🥗 Feeding, health & prevention

Care notes for the selected species. Not a diagnosis or personalised feeding prescription.

80-species atlas: more guidance → · Veterinary source ↗

How should results be interpreted?

Puberty, sexual maturity and an appropriate breeding age are not the same concept. Ranges are not predictions for an individual animal.

Lifespan ranges do not predict remaining years. Care, illness, genetics and environment affect outcomes.

Human-age comparison is provided only for cats as an approximate published convention. Life stages matter more for other species.

Feline stages: AAHA/AAFP describes kitten (0–1 year), young adult (1–6), mature adult (7–10), and senior (>10). For dogs, there is no single universal senior threshold; breed, size and health status matter. AAHA canine life stage definitions ↗

Frequently asked questions

Can every animal age be converted to human years?

No. Biological ageing across species does not share a universal scale; even cat equivalents are only rough analogies.

Does sexual maturity mean an animal should breed?

No. Welfare, full physical development and veterinary assessment are important.

Why is there no goldfish-to-human age?

There is no validated universal conversion. We report sourced lifespan information instead.