This has gotten worse over the years. At 6 years old he was diagnosed with ADHD. We eventually tried medication (Metadate
CD), and it seemed to help quite a bit.
From the very beginning, we noticed him doing funny things like continually licking his lips, or twisting his ears, or moving his foot around, flicking his toes or fingers, etc. We didn't pay much attention to this, as it wasn't an issue, and sometimes we thought he was just trying to be silly.