The Japan Rail Pass offers discounted rates for children. Eligibility is determined based on the child's age on the date the Exchange Order (voucher) is issued by JTB Canada.
Common Scenario: If your child is 11 years old on the day we issue the voucher, but turns 12 before you arrive in Japan or during your stay, they can still use the Child Pass for the entire duration of the trip. The age at the time of "issue" is the only one that counts.