Health & Fitness

Cat Age Calculator | Cat Years to Human Years (AAFP Life Stages)

Convert your cat's age to human years using AAFP feline life stage guidelines: kitten, junior, prime, mature, senior, and geriatric. See equivalent human age, life stage health priorities, estimated remaining lifespan, and indoor vs outdoor life expectancy comparison.

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AAFP Feline Life Stage Guidelines

The American Association of Feline Practitioners classifies cat life stages as: Kitten (0–6 months), Junior (7–12 months), Young Adult (1–2 years), Prime Adult (3–6 years), Mature Adult (7–10 years), Senior (11–14 years), and Super Senior (15+ years). Each stage has distinct nutritional and medical needs.

Indoor vs Outdoor Lifespan Difference

Indoor cats live dramatically longer than outdoor cats — an average of 12–18 years indoors versus 5–10 years for outdoor cats. Outdoor cats face risks from cars, predators, disease, parasites, and weather. Indoor cats are safer but require environmental enrichment to prevent boredom and obesity.

Key Senior Cat Health Concerns

Chronic Kidney Disease (CKD)	Affects 30–40% of cats over age 10 — treatable with diet and fluids
Hyperthyroidism	Most common endocrine disease in older cats — very treatable
Dental disease	Over 70% of cats show signs by age 3 — annual cleanings help
Arthritis	Often underdiagnosed — watch for reduced jumping, grooming changes
Cognitive dysfunction	Cat dementia — disorientation, vocalization, litter box changes

Note: These human-age equivalents are based on AAFP life stage guidelines. Individual cats vary significantly. Consult a licensed veterinarian — especially a board-certified feline specialist (ABVP-Feline) — for health guidance tailored to your cat.

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