AAHA and AAFP use four age-related cat stages. The boundaries help organize care, but they are starting points rather than guarantees about an individual cat.
| Cat age | Life stage |
|---|---|
| Birth to under 1 year | Kitten |
| 1 to under 7 years | Young Adult |
| 7 through 10 years | Mature Adult |
| Over 10 years | Senior |
Kitten
Kittens grow and learn quickly. Priorities include complete and balanced growth nutrition, body-condition tracking, safe play and climbing, scratching and hiding options, positive familiarity with handling and carriers, litter resources, identification, and a veterinarian-led preventive plan.
Record poor appetite, slowed growth, repeated stomach upset, marked tiredness, breathing changes, eye or nose discharge, and litter-box changes. Exact feeding and preventive schedules depend on the kitten and local risks.
Young Adult
Young adult cats benefit from predictable resources and daily opportunities to express normal behavior. Measured complete nutrition, interactive hunting-style play, climbing, scratching, hiding, rest, and comfortable litter areas can support a stable routine.
Cats can communicate discomfort through small changes. Note weight, appetite, water, urine, stool, vomiting, grooming, sleep, play, hiding, and social behavior. A shift matters because it is different for that cat, not because the stage predicts a diagnosis.
Mature Adult
From seven through ten years, consistent trend observation becomes especially useful. Compare body weight and muscle, jumping confidence, grooming, mouth comfort, litter-box access, water intake, urination, vomiting, behavior, and sleep with the cat’s own baseline.
Do not wait for a cat to look dramatically unwell before asking about persistent change. Cats may reduce play, choose easier routes, groom less, or interact differently. Those observations help a veterinarian decide what evaluation is appropriate.
Senior
Cats over ten enter the senior framework, but individual condition varies. Some remain physically robust; others need earlier environmental or medical support. Age is not a disease, and hiding, weight loss, house-soiling, poor grooming, or reduced movement should not be normalized as “just old age.”
Easy routes, warm resting places, non-slip surfaces, and low-entry litter boxes can make daily life more accessible. Track appetite, weight, muscle, water, elimination, movement, grooming, behavior, sleep, senses, and quality of life, then bring patterns to the veterinary team.
Indoor or outdoor lifestyle changes risk and preventive conversations, but it is not an age-conversion input. Use the Cat Age Calculator, read the cat age chart guide, or use the Senior Cat Daily Care Checklist.