I don't know about that being abnormal wear. That is the expected wear pattern that you would expect for a very old deer, as Art noted 8.5 - ancient in age. My guess would be 9 or over since the wear goes beyond what you see for most 8.5 year olds, but that may vary with diet. It could be that the wear seen is normal for 8.5 year olds in that area.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011