Correct an Apple ID Child account birthday to a teen account?

Apple has different age restrictions in different regions, but most of them trigger on/off based on the age of 13. If the birthday of a child account is entered incorrectly identifying the account as under 13, notable features (test flight, apple pay, and many others) on iPhone will not be available. Is there a way to correctly update a child's birthday, which moves them from a child account, to a teen account, and activate these features?