I beleive that some get that old looking grey to them in the face. I seen a couple doe's this year that i' passed up being I only had one tag this year that I beleive were in that 6.5 to 7.5 year old range if not older(They had no fawns either). They looked to be 140 to 150lb doe's with gigantic long wide heads with some of that old looking gray in them.