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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.
Now, the breed most often associated with a âsilent heatâ is the Somali. Also, most male cats will reach sexual maturity around 6 to 8 months of age (females can start as early as 4 months). This means that there is very short window of time where something could have happened.