Androdrox  What is that age though? That question has been debated over for years and here is the answer, when hey begin to produce testosterone. The reason this is when is because testosterone is a major part of building muscle. Children usually begin to produce testosterone around the age of 14-17 which means around the time they enter junior high or high school.he important thing to remember is that you need to only let your child lift weights under the proper circumstances. The proper circumstances means your child lifts only in a well designed program and only under constant supervision. If you are only looking to have your child do weight lifting to help them in a particular sport I would suggest you have them work on their skills and not to worry about weight training until their in high school. http://www.strongtesterone.com/androdrox/