That's especially true when they get to that Early Adolescent Stage (around 10 years old or so) and even more so when they become teenagers. (everettchristiancounseling.com)
By the time the children are at adolescent stages, the effectiveness of parent training is significantly reduced. (myvmc.com)
They have already grown out of that pesky adolescent stage and are wise beyond their nine lives. (dgpforpets.com)