My son started when he was 2.5 years old. He just took the assessment test and he passed so I let him try it for a couple of months in preparation for his pre-elementary. I want him to get used to doing tasks and homework from a regular school, although hindi naman talaga regular school ang Kumon but at least may exposure na yung bata.
Mine started at 5 years old but now kumon, its enopi or eyelevel. Some started at 3, like her cousin.