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Male cats hit puberty at about 9 months old. A female cat reaches  puberty at around 6 months old. A female who has reached puberty  and in in heat will be quite vocal.
At 6 months of age, a female cat can already reproduce. (If you use the seven-to-one rule, a 6 month old cat would be equal to a 3 Â½ year old person, and 3 Â½ year old people cannot reproduce.). In my chart, I figured that humans can reproduce around age 15. At 1 year of age, cat bones fully stop growing. This occurs in people at approximately 24 years of age, give or take a few years. Using this information (and 23 years of veterinary experience), I tried to devise a more realistic cat-human age chart that ends the seven-to-one rule once and for all.