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Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year.I advise unless you want kittens to keep her in at these times.Source(s): http://www.bestfriendspetcare.com/Pet_FA...at's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times. Source(s): http://www.bestfriendspetcare.com/Pet_FA...
They will keep going into heat until they die! So, you could have a 15 year old cat going into heat and getting pregnant! They go into heat until they die. My grandmother had a cat that was 20 and she went in to heat that year too. Yes, if they are not fixed, they stay in heat FOREVER, ie the rest of their lives -- 2 weeks on, 2 weeks off. Get your cat fixed. I have one that's at least 12 years old and still has kittens twice a year.