The<unk>  is the<unk>  at which an individual acquires, develops, or first experiences a condition or symptoms of a disease or disorder. For instance, the general<unk>  for the spinal disease scoliosis is "10-15 years old," meaning that most people develop scoliosis when they are of an<unk>  between ten and fifteen years. Diseases are often categorized by their<unk>  as congenital, infantile, juvenile, or adult. Missed or delayed diagnosis often occurs if a disease that is typically diagnosed in juveniles (such as asthma) is present in adults, and vice versa (such as arthritis). Depending on the disease,<unk>  may impact features such as phenotype, as is the case in Parkinson's and Huntington's diseases. For example, the phenotype for juvenile Huntington's disease clearly differs from adult-onset Huntington's disease and late-onset Parkinson's exhibits more severe motor and non-motor phenotypes.
Age of onset
Functional symptom
Seizure types
Severity of illness
History of neuroimaging
Delayed milestone
Ego-dystonic sexual orientation
Listening behaviour types