It’s not that your kiddo doesn’t want to be rational; they simply don’t have the capacity like an adult does. In fact, there’s a reason children seem to respond in the seemingly fight or flight mode. “Your teenager’s brain is still developing and this miracle won’t be even somewhat done until they are at least 25 years or older,” said Carla Buck, a mental health therapist at Warrior Brain, who explains that children, unlike adults, process information with the emotional part of their brain.