How to Calculate Your Cat’s Age in Human Years — Complete Guide
Cat Aging Milestones (AAHA/AAFP Standard)
Year 1: 15 human years (kitten to adolescent — fully grown by 6 months, sexually mature by 1 year). Year 2: 24 human years (young adult). Years 3–6: each year ≈ 4 human years. Years 7–10: each year ≈ 4.5 human years (mature adult). Years 11–14: ‘senior’ — each year ≈ 4–5 human years. Years 15+: geriatric — equivalent to 76+ human years.
Life Stage Categories for Cats
Kitten: 0–6 months. Junior: 7 months–2 years. Adult: 3–6 years (28–40 human years). Mature: 7–10 years (44–56 human years). Senior: 11–14 years (60–72 human years). Geriatric: 15+ years (76+ human years). Understanding life stage guides appropriate nutrition, health screening frequency, and behavior expectations.
Senior Cat Health Considerations
Cats are considered senior at 11+ years. Senior cats are prone to: hyperthyroidism (most common senior cat endocrine disorder), chronic kidney disease (affects 30–40% of cats over 15), dental disease, arthritis, and cognitive dysfunction syndrome. Annual bloodwork recommended for cats over 7; twice-yearly over 11.
How to Use the Pet Age Calculator
Enter your cat’s age in years in Pet Age Calculator and select species (cat). The calculator shows the human-equivalent age, life stage, and context-specific notes about typical health needs at that stage.
Frequently Asked Questions
Calculate your cat’s age
Open Pet Age Calculator to find your cat’s equivalent human age and life stage.
Open Pet Age Calculator