ADHD yes trough many avenues: change of environment, development, therapy and techniques, medication. Autism: Depends on definition of recovery. If you define it as “no large problems that hinders functioning and happiness”, then yes. If you define at all the symptoms and characteristics that are the cardinal features of the condition; as “completely gone”, then no. And more so the further into the spectrum the person is. People underestimate how noticeable true full blown autism is since it’s been conflated with Asperger’s level of presentation. Note: Many people with autism have happier, more productive lives than neurotypical people, so it’s more of personality description than a disease for them.