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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.
Cat Age Calculator. You'll notice on the cat age calculator above, the biggest differences between the rates at which cats age compared to humans is over the first 2 years of the cat's life. A cat at one year of age is thought to be about 15 in human terms, as cats reach full sexual maturity at one year, whereas humans reach it at about age 15. At 2 years old, cats are thought to be fully grown and completely mature - the equivalent of a human in their early to mid 20s.