It's been awhile since the subject of depth has come up. I haven't looked at PADI's site for some time, (since it was dumbed down and became little more than a marketing site), about 5 years ago.
Before they re-vamped it, it was very clear and specific. OW divers over 16 yo were permitted to go to 130', as were Jr OW divers who were accompanied by a parent or dm. Jr OW divers without such supervision were permitted to 60 feet.
All of us, the missus, our two boys who were 12 and 14, and I were taken to 60' for our final checkout dive in Puget Sound 42 degree water, and 4' vis. Our instructor demanded proficiency, and had the tools to ensure that we were. One of the top 5 teachers in my life; from kindergarten through 7 years of college.