We have a lot of data on this from keeping harvest records and aging jawbones at our place. The majority of the 4 1/2 yr olds we have killed recently score in the 120s. Of course there are outliers, we have killed some that were 130+ and we even killed one that only scored 82" but was definitely 4 1/2 yrs old.

As has been said, it all depends on where you are hunting, but I would guess that statewide the average 4 1/2 yr old deer is about 110"