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Kittens typically reach a length and weight close to their full-grown size by 9 to 12 months of age. After the 1-year mark, most cats continue to grow at a much slower rate until at least 18 months of age. Large breeds, such as Maine coon cats, typically take even longer to grow to their full size. These cats may not be fully grown until they reach 2 to 4 years of age.
of 04. Life Stages of Cat Years: Kittenhood Kitten Jaspurr in Vet's Office at 6.5 Weeks. Photo Credit: Â© Franny Syufy Kittenhood is the first life stage of cats. Kittenhood lasts from birth to one year (approximately 15 years in human age), and marks the fastest growing stage of a cat's life.