Child Benefit generally stops after the child turns 18 in Canada. Specifically, the Canada Child Benefit (CCB) stops the month after the child’s 18th birthday. The benefit is intended only for children under 18 years old. In the UK, Child Benefit stops automatically on 31 August after the child's 16th birthday, unless the child stays in approved education or training. In that case, Child Benefit can continue until the child turns 20, provided the education or training is approved. Child Benefit also stops if the child starts working 24 hours or more per week, starts receiving Universal Credit, or leaves approved education. Summary:

• Canada: Child Benefit stops the month after the child turns 18.
• UK: Child Benefit stops 31 August after the child turns 16 unless they continue in approved education/training, in which case it can continue until age 20.

This addresses when Child Benefit stops depending on country and conditions related to education or work status of the child.