[in9]

symptoms can change through time, and be triggered by life events. It can be that a person had the coping mechanisms for one manifestation of symptoms, but due to external events, they don't work anymore.

The book I'm reading, Taking Charge of Adult ADHD, mentions that for an evaluation and diagnosis to be reliable in adulthood, the current form of symptoms should be happening for the past 6 months.

great book btw, highly recommend it.