The age of onset affects the person's self-identity. People with a recent onset and a prior history that indicates functioning within ACL 6 often have a sense that their cognitive ability has been reduced. The realization may not last long and usually occurs when they compare what they just did with what they have done in the past that had very similar content. Incorporating the realization into changing their life goals often has fuzzy comprehension.
People with a history that indicates that this has always been their best cognitive ability often claim to be smarter than everyone else and seldom recognize a lack of knowledge.