Hi Amy - I can't speak for myself, but my husband wasn't diagnosed with ADD until he was 31. I think that the symptoms range widely; AlliKamikaze posted a comprehensive description of a model of the different ADD types - ADD Types

My husband's symptoms aren't the typical "I can't concentrate" variety. He gets frustrated and angry easily when trying to learn certain types of things. He procrastinates like hell if he isn't sure how to do something. He's been called an airhead by his friends and former coworkers, although I have to say that I don't see him as an airhead at all. He has absolutely NO ability to prioritize, and when faced with two equally important tasks, he will quiver and waffle out of indecision.

Out of the list that AlliKamikaze posted, my husband fits "Overfocused", "Ring of Fire", "Limbic", and "Temporal Lobe", to a T. He has no hyperactivity characteristics. He is also extremely avoidant.

He really suffers from anxiety and depression and once we got the depression under control, it was a lot easier to see the underlying causes. The lines are really blurred between ADD, Anxiety and Depression, not to mention just general personality traits. He is also very sensitive to sounds and textures.

I believe that it's worth mentioning that there is a lot of focus on the 'negative' aspects of ADD but there are positive factors as well. My husband has an uncanny ability to see EVERYTHING. Typical example is when we're driving in the car. He can drive and look straight ahead, and I can point out something small and obscure on the side of the road and he will have already seen it. He misses nothing. He's a still water that runs deep and is an excellent observer of human nature. When he's not depressed or irritable, I trust his judgement completely. He is an incredibly talented artist, photographer and craftsman. He's got a great eye for design and composition. We have always joked that he needs things to be 'just so' and named his ficticious company "Just So"... years before he was diagnosed with ADD. He sniffs out quality in a way I cannot comprehend - he can spot flaws a mile away. (I could go on for years about how great he is, but I'm trying to be specific to the seemingly ADD-related qualities)

Does that help?