Tool · Feline
Cat Age Calculator
Feline life-stage arithmetic following the AAHA/AAFP guidelines — kitten, junior, prime, mature, senior, geriatric — with accurate human equivalents.
1 year · Junior
15human yrs
A 1-year-old cat corresponds to roughly 15 in human years.
Reference
Common questions about cat age
- How do cats age compared to humans?
- A 1-year-old cat is roughly a 15-year-old human. A 2-year-old is ~24. After that, each cat year adds ~4 human years. This is the AAHA/AAFP consensus based on feline life-stage guidelines.
- When is a cat considered 'senior'?
- 10+ years is senior; 15+ is geriatric. Annual wellness exams become twice-yearly at senior stage.
- Do indoor vs outdoor cats age differently?
- Biologically no — the conversion is the same. But indoor cats live 12–18 years while outdoor cats average 3–5 due to traffic, predators, and disease. Most age-in-human-years calculators assume indoor.
- Does breed affect cat aging?
- Less dramatically than dogs. Siamese and Burmese tend to live longer (15–20 years); Maine Coons and Persians slightly shorter. The calculator here uses the AAHA standard applicable to all breeds.
- Why is the first year worth so many human years?
- Cats reach sexual maturity around 6 months and full adult size by 12. That first year compresses what humans experience over ~15 years — puberty, skeletal maturity, cognitive development.
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