How old is a 6-month-old kitten in human years?

≈ 8 human years.

Roughly a human pre-teen: nearly independent, fully vaccinated, usually spayed or neutered.

Kittens front-load their ageing: the first twelve months are worth about 15 human years, which is why a six-month-old kitten is closer to a human pre-teen than a toddler.

Nearby ages

3 months4 human years
4 months5 human years
5 months6 human years
6 months8 human years
7 months9 human years
8 months10 human years
9 months11 human years
12 months15 human years

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