Isay it all depends on your Bowhunting "stage" in life.
I would let him pass since I'm into my 52nd year of Bowhunting BUT would love one of my kids to get a shot at something that size-even in IOWA!!!!!! I would never tell anyone he was to small-it's an individual decision.
This is what got to close about 4:30 yesterday-no horns at all but have let some spikes & forkeys walk even closer....