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//Reported prevalences of growing pains have been between 2% and 46% of children.[2] Growing pains are said to typically occur in two periods during a child's life, firstly, between about 3 and 5 years old, then later in 8 to 12 year olds.[3] There are however no published epidemiological studies to support this observation. Individuals can vary markedly in when they experience growing pains//
He's nearly 16. If he was younger I would have put it down to growing pains.