OK I'll bite - what is an "advanced" diver?
Put three divers in a room and you'll get 4 definitions.
Personally I know it when I see it, and it sure isn't any particular number of dives.
Advanced is such a meaningless term - I would prefer something that describes the conditions that you will meet - currents of X knots, water temp of X degrees, simultanious back roll entries, hot entries, ability to descend at X rate, blue water ascents in low vis, typical wave hights, etc. etc. would be much more useful.
Research can get you all of this, but few do it.
By definition the word ADVANCED is a relative term - whether in scuba or anywhere else. As such it is only useful in a comparative and not an absolute fashion. Additionally, it is an adjective, which by definition is used to modify a noun.
advanced - placed ahead or forward; ahead or further along in progress, complexity, knowledge, skill, etc.
An "Open Water Diver" is a beginner. So an "Advanced Open Water Diver" is a beginner who is ahead or further along than other beginners.
While I understand that some folks might be a touch confused into thinking that they are "advanced divers" after receiving an "advanced open water" certification...I do believe that more than half of the problem here lies in their own naivete and/or intellectual laziness. (Or maybe I just spent too many years in Catholic school diagramming sentences.)