Well at my Scuba place I think it's 9.
No you don't.
Old enough to pee
Depends on the country you do them in , but there is generally a certificate for Scuba and another for Small Boat Seamanship.
10 years old or older
Yes, you can if you have a lobster license. You can get one easily. However, after a certain amount, you need a commercial license. If you can find a pond or lake with them, you can dive for them with a license.
They don't necessarily have to be, I think.
To be a Scuba Diver you have to take a course in scuba diving which varies in cost depending on how old you are or where you are in the world .
Old people don't need to get in the ocean
In NY u can get a juniors license at 16 years old. And a full license at 17
Today, kids can begin experiencing diving from a young as 8 years old.
15 years old for a moped license in MI.
You have to be 34 to have your provision license.