As of October 24, 2017, children under 22 years of age are eligible as dependants, as long as they are not married or not in a common-law relationship.
Children 22 years old or older qualify as dependants if they meet both of these requirements:
they have depended on their parents for financial support since before the age of 22, and
they are unable to financially support themselves because of a mental or physical condition
You can use our online tool to see if your child qualifies as a dependant.