Diagnosed at 43-44. Went to psychologist, talked about why I wanted an assessment, did a questionnaire. Had a second appointment, asked questions based on first questionnaire, did another one while also assessing for other co-morbidities. Wound up doing at least two more questionnaires, plus my spouse and wife did one each. Received ~10 page report that several aspects of the ADHD “spectrum”, as well as other common co-diagnoses such as anxiety, depression, autism. We discussed to ensure I was ok with it and understood it, she suggested other resources and tools, and I took that to my PCP to start trialling medications.