it's the rules that count not the AMEs arithmetic. If he had put 2030 instead of 2003 would you expect to have an extra 27 years .....?
Yeah, but I shouldn't have to know the rules better than the AME, and the expiry date on mine wasn't
obviously wrong - I always believed that the a medical issued during your twenties was valid for five years ('cos the AME told me so...

).
I think it's serious because if I hadn't seen the question in the Medical forum then i'd have been flying 'PIC' without a licence for seven months ... and if i'd crunched the aeroplane during that time guess what the insurance would have said? I've had a couple of emails from others in the same boat so at least this thread has done some good