Fisherman, you must be kidding. Minors are not allowed legally to have sex, vote, drink, join the military or drive, because it is well established that they do not have the maturity to make responsible decisions at that age.
Two out of every three people raised as JWs end up leaving, which is a significant indication that these children did not make a mature and educated decision. Usually at that age they are simply trying to keep family and friends happy. As kids they have no idea what they are doing, it is coercion in every case, based on biased indoctrination.