How old is my cat in human years? And how old do cats get?

A cat does not age one-seventh as fast as a person. A cat grows up in its first two years: about 15 human years at the first birthday and about 24 at the second. After that, each cat year counts for roughly 4 human years.

A 6-month-old kitten is comparable to about a 10-year-old child, and a 10-year-old cat to a person of about 56. Charts differ by a year or so at the start: Cornell gives 16 and 21, VCA 15 to 16 and 24 to 25. The numbers are a comparison, not a measurement.

Vet authors use a similar picture for check-ups: a year of an adult cat's life is like several years of a person's, so health can change between yearly visits.

The 2021 AAHA/AAFP guidelines name four age stages: kitten (birth to 1 year), young adult (1 to 6), mature adult (7 to 10) and senior (over 10), plus an end-of-life stage that can come at any age.

The 2010 guidelines had six stages (kitten, junior, adult, mature, senior, geriatric from 15). You will still find those on many sites and charts.

The age bands are guidance, not absolutes. Some cats of 10 or older are in excellent condition and are best treated as mature adults, at the vet's discretion. Each vet visit should check the life stage, because a cat can move to the next stage in a short time.

As a kitten, it is about vaccinations, parasite control, socialisation and neutering. Young adults can see relationships with other cats in the home shift at 1 to 2 years, and they tend to gain weight because they play less. Weight gain is most common in middle age.

From 7 to 10 years many cats begin to show age-related changes, and most do by about 12. Typical changes are a weaker immune system, thinner skin, poorer grooming, brittle overgrown claws, hearing loss, dental disease, kidney changes and arthritis. Older cats are more likely to get long-term conditions such as chronic kidney disease, diabetes, dental disease and an overactive thyroid, and certain cancers.

Behaviour changes in an older cat, such as more meowing, missing the litter box, avoiding a favourite spot or changed sleeping and eating, are often linked to medical conditions, including pain. They are not just 'old age'. Old age is not a disease in itself, and care decisions should not be based on age alone.

There is no single number, because studies measure different things. In the UK, a 2024 study of VetCompass records gives an average life expectancy at birth of 11.7 years. In US clinic records it is 11.2 years. Another measure is the median age at death: 14.0 years in a large English sample of cats that died between 2009 and 2012. Over 85% of those deaths were euthanasia, so the age also reflects decisions, not only illness.

These numbers are not the same thing and should not be mixed. Life expectancy at birth counts all cats, kittens included. The median age at death counts only cats that died.

Commonly quoted figures say house cats die on average at 11 to 14 years, and with good care they commonly reach 12 to 15. Twenty or more is not unlikely. Cats have also been living longer: the average is said to have risen from about 7 years in the early 1980s to about 13 years in 2014 and 2023. Females live about one to 1.3 years longer than males.

Weight matters: in the English study, heavier adult cats lived shorter lives, and severe obesity is linked to a shorter life. One US study found cats at body condition 4 of 5 living longer than ideal-weight cats, but that is observational and not a reason to let a cat gain weight.

In a UC Davis study of about 3,100 cats that died at the hospital (1989 to 2019), outdoor-only cats had shorter lives than indoor-only cats. Cats that went both in and out did not live significantly shorter than indoor-only cats. Those cats were from a hospital, not a random sample. Trauma, mostly road accidents, was the main cause of death in cats under 5 in England (47%).

The simple indoor-or-outdoor split is called too simple: housemates, other cats, and boarding or shelter contact also change the risks. Cornell advises keeping cats indoors because of infectious disease, parasites and cars. A closed garden, balcony or harness walk gives safe outside time.

Neutered cats lived longer in every study that looked. In England the unadjusted medians were 15.0 against 11.0 years, but after adjusting for other factors the gain was about 0.6 years for neutered females, and entire males lived about 1.8 years less than entire females. Neutering can change how much a cat needs to eat, so the weight should be checked afterwards.

Mixed-breed cats lived somewhat longer than purebred cats in England (median 14.0 against 12.5 years; about 0.6 years after adjusting). In the US, purebred cats were slightly higher (11.5 against 11.1 years at birth).

In the English sample the longest-lived breeds were Birman (16.1), Burmese (14.3), Siamese (14.2) and Persian (14.1). The shortest were Bengal (7.3), Abyssinian (10.0), Ragdoll (10.1), Maine Coon (11.0) and British Shorthair (11.8). Numbers per breed were small (11 to 70 cats), so these are indicative only. A UK life table has Sphynx shortest (6.8 years) and Burmese and Birman longest (14.4).

The Ragdoll authors think the shorter Ragdoll life is mostly linked to being purebred, not to the breed itself. No breed can be called genetically healthier than another. Extreme body shapes can shorten life, and inherited kidney disease in Persians and related breeds can lead to early death. Ask a breeder which health tests the parents had.

The oldest verified cat is Creme Puff, a mixed tabby in Austin, Texas, born on 3 August 1967 and died on 6 August 2005, aged 38 years and 3 days (Guinness World Records). The record before that was held by Granpa Rexs Allen (part Sphynx, part Devon Rex), at about 34 years. His exact age was later questioned by the owner.

Many cats on lists of long-lived cats are reported at 30 or more, but most ages are estimates or hearsay. Flossie, born in 1995, is listed as the oldest living verified cat at 30 (late 2025); record holders change and Guinness does not publish every change at once. Only a small share of cats gets anywhere near 30.

A stray or adopted cat has no birth certificate, so its age is an estimate. Pedigree cats have their birth date in the breed register.

In a check-up the vet looks at teeth, gums, eyes and coat: tartar, broken or retained baby teeth, cloudy eyes and hair loss are noted. These are signs of condition as much as of age, and they depend on care and genes, so a vet's age guess is a range. Ask your vet for a best estimate and write it down. The calculator on this page works from that guess.

Vets recommend at least one examination a year for every cat. From 7 years on, many guidelines suggest a check-up twice a year, and senior cats at least every 6 months, or more often with a long-term condition. Check-ups for older cats often include blood and urine tests, thyroid testing and blood pressure, at least once a year. The vet decides what is right for your cat.

Cats hide illness well, so serious problems can be far along before signs show. A weekly look at teeth, gums, ears, skin and coat, and for lumps, helps (ask your vet to show you how). Dental disease is very common and tooth brushing with pet toothpaste is called the most effective way to prevent it. Weight loss and weight gain both matter and can have medical causes.

Never assume a change is 'just old age'. Many conditions that appear with age can be controlled when they are found early.