How to Calculate a Cat's Age in Human Years?

Contrary to the popular belief that you simply multiply a cat's age by 7, the reality is more complex. Cats age much faster than humans during their first years of life, then the pace slows down.

Why Do Cats Age Faster?

Cats reach their sexual and physical maturity much faster than humans. A one-year-old cat is already considered a young adult, capable of reproducing and living independently. This difference in development explains why the calculation is not linear.

The Recognized Conversion Scale

Veterinarians and feline experts generally use this scale:

• The first year of a cat equals approximately 15 human years
• The second year adds approximately 9 human years (24 years at age 2)
• Each subsequent year corresponds to approximately 4 human years

Cat Age to Human Age Conversion Table

Cat Age	Human Age Equivalent	Life Stage
1 year	15 years	Teenager
2 years	24 years	Young adult
3 years	28 years	Adult
4 years	32 years	Adult
5 years	36 years	Adult
6 years	40 years	Mature adult
7 years	44 years	Mature adult
8 years	48 years	Mature adult
9 years	52 years	Senior
10 years	56 years	Senior

The Different Life Stages of a Cat

• Kitten (0-6 months): Rapid growth, learning, socialization
• Junior (6 months - 2 years): Adolescence, sexual maturity, full of energy
• Adult (3-6 years): Peak physical condition, stable behavior
• Mature (7-10 years): Beginning of aging, less active
• Senior (11-14 years): Visible aging, specific needs
• Geriatric (15+ years): Old age, adapted care required

Factors Influencing a Cat's Life Expectancy

The average life expectancy of a domestic cat is 12 to 18 years, but several factors can influence this duration:

• Lifestyle: An indoor cat generally lives longer than an outdoor cat
• Diet: Nutrition adapted to each life stage is essential
• Veterinary care: Regular visits help detect problems early
• Breed: Some breeds have particular genetic predispositions
• Neutering: Neutered cats generally live longer