Korat Age Calculator
One of the oldest natural breeds, documented in Thai manuscripts dating to the 14th century. Silver-blue single coat, heart-shaped face, peridot-green eyes. Quiet, intelligent, and forms an intense bond with one person — sometimes uneasy with multi-cat households. Korats typically weigh 6–10 lb (2.7–4.5 kg) at adulthood, with a typical indoor lifespan of 15–20 years.
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Personalized, breed-aware, and lifestyle-adjusted. Indoor-only cats live more than twice as long as outdoor cats — we factor that in.
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Start typing to filter. Most household cats are best estimated with the "Mixed / unknown" tab.
Using the standard AAFP/AAHA formula for a typical domestic cat. No breed required.
That's about the same as a human young adult.
Adult — Prime years; maintain weight and dental care.
Indoor cats live nearly 3× as long as outdoor cats on average.
How long do Korats live?
Indoor Korats typically live 15–20 years, with a median lifespan around 18 years. Outdoor-only or indoor-outdoor cats average closer to 6 years regardless of breed — trauma (vehicles, predators), infectious disease (FIV, FeLV), and toxin exposure account for the gap. Within indoor lifestyles, the strongest modifiable longevity factors are body condition (BCS 4–5/9 — most indoor cats trend overweight), dental care from kittenhood (gingivitis and resorptive lesions accumulate silently from age 3), and lower urinary tract management (wet-food rotation reduces FLUTD risk in neutered males).
Origins of the Korat
An ancient natural breed from Thailand documented in Thai manuscripts dating to the 14th-19th centuries - the Tamra Maew (Cat Book Poems), illustrated cat-care manuscripts from the Ayutthaya kingdom period (1351-1767), depict 17 types of Thai cats including the silver-blue Si-Sawat that corresponds to the modern Korat. Thai folklore considered Korats good-luck wedding gifts and household guardians. The breed reached the West in 1959 when Cedar Glen Cattery owners Jean Johnson and Daphne Negus imported the first breeding pair (Nara and Darra) from Thailand. CFA championship recognition came in 1966. The breed remains uncommon globally - typically fewer than 100 active breeders worldwide - and the breeding population sits behind annual GM1 and GM2 DNA screening protocols. Korat refers to Si-Sawat cats from Korat Province in northeastern Thailand specifically; not all Thai silver-blue cats are Korats.
How a Korat ages
Korats reach social and physical maturity in the first two years, and from then on the rate is ~4 human years per cat year. Some sources call this the "feline universal curve" because it varies so little between breeds. By age 7, a Korat is 44 in human terms.
Korats are documented to reach 20+ years on a routine basis when indoor-only living and standard care converge. The breed lacks the morphological extremes that compress lifespan in flat-faced or hairless cats, so the published ceiling is genuinely achievable rather than aspirational.
Korat age conversion at a glance
| Korat age | Human-equivalent |
|---|---|
| 1 year | 15 human years |
| 2 years | 24 human years |
| 5 years | 36 human years |
| 8 years | 48 human years |
| 12 years | 64 human years |
| 16 years | 80 human years |
Korat weight chart
Adult weight for the Korat typically falls between 6–10 lb (2.7–4.5 kg). Weight outside this range is worth a vet conversation: BCS 4–5/9 (a thin fat layer over palpable ribs, visible waist from above, slight abdominal tuck) is the goal regardless of where in the breed range your individual cat lands.
| Stage | Typical weight (Korat) | What to watch |
|---|---|---|
| 8 weeks (kitten) | ~1.5–2.2 lb | Trajectory matters more than absolute weight. Weigh weekly. |
| 6 months | ~5.5–7.5 lb | Most cats at ~65% of adult weight by 6 months. |
| 12 months | ~8.5–10.0 lb | Most cats fully grown. Maine Coons and Ragdolls continue to ~3-4 years. |
| Adult (1y+) | 6–10 lb | Hold steady at BCS 4-5. Indoor cats prone to weight gain; meal-feeding beats free-feeding for control. |
Stage weights are kitten-growth-curve approximations. Individual cats vary ±20% from these midpoints. For ideal weight + weight-loss math, use the ideal-weight calculator with current weight + BCS.
Care notes for Korats
- GM1 and GM2 gangliosidosis — fatal autosomal recessive lysosomal storage diseases; DNA test should be standard for breeders
- Generally a long-lived, robust breed with a relatively healthy gene pool
- Standard indoor cat priorities — dental, weight, urinary monitoring
- Newcomer-to-household adjustment is unusually long — plan slow introductions and a quiet space
- Weekly brushing is enough for the coat; daily during shedding seasons.
- Dental health is the most under-diagnosed cat issue — annual cleanings from year 5 onward.
This is general breed-aware guidance. Always discuss specific concerns with your veterinarian.
Korat life-stage milestones
AAFP's generic kitten/adult/senior bands miss the breed-specific timing windows. The stages below are calibrated for the Korat:
- 8 weeks (kitten arrival): Verify GM1 and GM2 gangliosidosis DNA test results from breeder - both are fatal autosomal recessive disorders. Begin slow socialisation - the breed is naturally reserved with new environments.
- 6 months (adolescence): Spay/neuter window. First cardiac auscultation. First dental exam. The breeds intense one-person bonding consolidates - introduce all household members early.
- 1 year (young adult): Skeletally mature at 6-10 lb. Annual cardiac auscultation. Establish quiet predictable routine - new household members or pets require slow introduction.
- 3 years (prime adult): Annual cardiac auscultation. Annual senior bloodwork. The breed is genuinely robust beyond the GM1/GM2 risk window (which closes by 2 years). Cognitive sharpness preserved.
- 11 years (mature/senior): Senior status. Annual senior bloodwork with renal panel. Standard age-related cancer screening. Most chronic disease is age-related rather than breed-specific.
- 15 years (geriatric): Korats commonly reach 18-20 years - among the longest-lived breeds. Cognitive dysfunction screening. Quality-of-life focus: renal support, dental maintenance, continued predictable household routine.
Similar breeds you might be comparing
- American Shorthair — short-haired, 15–20 year lifespan
- Russian Blue — short-haired, 15–20 year lifespan
- Siamese — short-haired, 15–20 year lifespan
Sources cited for the Korat
- Cat Fanciers Association breed standard - Korat.
- Muldoon LL, Neuwelt EA, et al. "Identification of the molecular defect in a feline model for type II GM2-gangliosidosis (Sandhoff disease)." American Journal of Pathology, 1994.
- Bradbury AM, Morrison NE, et al. "Neurodegenerative lysosomal storage disease in European Burmese cats with hexosaminidase beta-subunit deficiency." Molecular Genetics and Metabolism, 2009.
- Korat Cat Fanciers Association - GM1 and GM2 screening guidelines.
- Lipinski MJ, Froenicke L, et al. "The ascent of cat breeds: genetic evaluations of breeds and worldwide random-bred populations." Genomics, 2008.
Methodology: AAFP/AAHA Feline Life Stage formula. See the main cat age calculator for full methodology, indoor/outdoor lifespan model, and citations.
Korat age FAQ
How long do Korats live?
Indoor Korats typically live 15–20 years, with a median lifespan around 18 years. Outdoor-only or indoor-outdoor cats average closer to 6 years regardless of breed — trauma (vehicles, predators), infectious disease (FIV, FeLV), and toxin exposure account for the gap. Within indoor lifestyles, the strongest modifiable longevity factors are body condition (BCS 4–5/9 — most indoor cats trend overweight), dental care from kittenhood (gingivitis and resorptive lesions accumulate silently from age 3), and lower urinary tract management (wet-food rotation reduces FLUTD risk in neutered males).
How old is a 7-year-old Korat in human years?
Using the AAFP/AAHA formula, a 7-year-old Korat is approximately 44 human years old. Try the calculator above with your cat's actual age, months, and lifestyle for a precise answer.
What is the typical lifespan of a Korat?
Indoor Korats typically live 15–20 years. Korats are documented to reach 20+ years on a routine basis when indoor-only living and standard care converge. The breed lacks the morphological extremes that compress lifespan in flat-faced or hairless cats, so the published ceiling is genuinely achievable rather than aspirational.
When does a Korat become a senior cat?
Most cats — including Korats — are considered senior starting at 11 years per AAFP guidelines. Mature stage (subtle age-related changes) begins around 7 years. Super-senior (geriatric) is 15+ years.
Are Korats good indoor-only cats?
Yes — almost all domestic cats, including Korats, do best as indoor-only cats. Indoor lifespan averages ~15 years versus ~6 for outdoor-only cats, and the breed's quality of life isn't significantly different indoors with appropriate enrichment (vertical space, play, window perches).
Should I DNA-test a Korat kitten before adopting?
Ideally the breeder should test the parents, but verify in writing. The breed carries autosomal recessive GM1 and GM2 gangliosidoses, fatal lysosomal storage diseases that cause neurological deterioration starting around 2–4 months of age. Both conditions have validated DNA tests now widely available. A reputable Korat breeder will provide results showing both parents are clear, or that the breeding paired clear-with-carrier. Walk away from any breeder who declines to share these results — affected kittens have no treatment and short, distressing lives, and the test is cheap relative to the heartbreak.