My 8-year old AS child is in exactly the same boat, but in terms of ingesting things. He will not drink or eat anything that any other family member has touched, drank from, etc. While this is fine most times, when we're somewhere where drinks are expensive, it's a definite minus. He is also extremely conscious of bugs and hates them.
To be honest, I wouldn't worry unless it doesn't get better over time. Two years ago, my DS couldn't handle even seeing a fly. Now, he actually opens the door and lets them out. It is slow progression, but as long as I see it...I don't worry.
