After 5+ years with long hair and a goatee, I went off on a holiday to see my family and came back with a #2 and clean shaven. Some of my friends of over 5 years didn't recognise me. A couple of my awesome friends (@ryivhnn for one) were completely unaffected by the change and just continued as if nothing had changed. Which might have freaked others out even more.

Oh, and short hair and clean shaven, I last got asked for ID about 3 years ago. age 38...