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It's perfectly fine at his age as long as his expectations/goals are reasonable. (In other words, he should expect to gain muscle and strength, but not want to be huge right away or have immediate plans to be a power lifter.) Restrict him to working only the major muscle groups, which I think a BowFlex would limit him to anyway. Higher repetitions will tone while slowly building muscle.
At his age, the truest goal of moderate weight lifting/bodybuilding is self-esteem and confidence. I never had any as a teenager, but I hear it's a good thing.
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