How can we recognize and discem the spirit​

Pray about and ponder the scriptures. The scriptures open the window to revelation. Believe that God will answer your prayers. Recognize that God's thoughts are not your thoughts (see Isaiah 55:8–9), and trust God to answer your prayers in His own way and in His own time.

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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.