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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.
Kittens: Stages of Development (Newborn-12 weeks) Though your cat may look nearly full-grown by the time he or she is one year old, cats are. actually still considered kittens until they are two years old. It takes two years for a. cat to complete it's development in both mind and body. During its first two years. of life, your kitten will go through several developmental stages, but the most. important developments occur within the first twelve weeks of life.