It's a good question, I'm not sure I could give a confident answer, as the boundary is blurry to me.
I did have, for most of my life since childhood, what I would feel confident calling strong ADD indicators. The two psychiatrists I've spoken with agree with me, and while I didn't get this deep into the conversation with them, my personal feeling is that like many things it's a spectrum[1], that all humans are at least somewhere on that spectrum.
I did struggle to maintain a job and a home prior to being medicated, and since have been gradually moving towards a life that's normal and happy for me.
YMMV.