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Most dogs go into heat twice a year. Most common cycling frequency for female dogs is every six months or twice a year. Many dogs have this like a clock set up and are cycling at exactly predictable rate. Many dogs go into heat more frequently. Three times per year is quite a common occurrence and considered normal.
A dog will generally go into heat every 6 months. It can vary though as some dogs will be every 4 months or every 8 months. Usually the first heat will start any time after 6 months of age. They can continue to have heats throughout their whole lives but often do stop as they get older. There's no specific age though.