The most common mental illnesses in children include, but are not limited to, ADHD, autism and anxiety disorder, as well as depression in older children and teens. Having a mental illness at a younger age is much different from having one in your thirties. Children's brains are still developing and will continue to develop until around the age of twenty-five.[31] When a mental illness is thrown into the mix, it becomes significantly harder for a child to acquire the necessary skills and habits that people use throughout the day. For example, behavioral skills don’t develop as fast as motor or sensory skills do.[31] So when a child has an anxiety disorder, they begin to lack proper social interaction and associate many ordinary things with intense fear.[32] This can be scary for the child because they don’t necessarily understand why they act and think the way that they do. Many researchers say that parents should keep an eye on their child if they have any reason to believe that something is slightly off.[31] If the children are evaluated earlier, they become more acquainted to their disorder and treating it becomes part of their daily routine.[31] This is opposed to adults who might not recover as quickly because it is more difficult for them to adapt.