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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.
Starting from about five months till ten months of age, female cats mature sexually and have their first estrous cycle. The average age for a cat going into heat is when they are around 6 months old. This is the time during the reproductive cycle when the female cat is most fertile and is most likely to conceive.