What is propaganda?
a. a logical, scientific argument answering a complicated question.
b. a fact-based collection of information designed to explain events to the masses.
c. a deliberate spread of information designed to shape people's views and actions.
d. an inaccurate use of facts to convince people to take the wrong side of a position.

the answer is a) to be able to obey them.

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.