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I do have an exception to bl6394's comment about Jr Open water. There are NO depth limitation recommendations after 12yrs old beyond the standard OW cert. If you read the card very specifically (I do not have one here so there could be minor differences), it states a parent or guardian until 12 with a depth limit recommendation listed. After 12, it only states a certified adult diver with no depth limit recommendation. While this may apply to instruction and insurance, it is only a recommendation. As is often stated, there are no scuba police and no 'laws' regarding any diving depths for any certification I am aware of. An instructor is bound by their agency and a dive shop/boat may/is bound by their insurance. Other than that, any limitation is a recommendation. There are many certifications that have instructor imposed limits that are different from the maximum recommendations printed on the actual card. These help protect students and instructors during the training program.
Packrat12 - the following is taken from the Key Standards on page 30 of the 2015 PADI Instructor Manual
Age 12 to 14 Year Olds
Depth Maximum 18 metres/60 feet for Junior Open Water
Divers. Maximum 21 metres/70 feet for continuing education.
After certification Must dive with an adult certified diver
While this is a recommendation, if training agencies limit a junior diver's excursion's with an instructor - would a prudent parent - lacking an instructor certification and training - choose to exceed those limitations? Hopefully not.