The most naive deer in the woods is the nub buck (the true yearling). The 1 1/2 year old is not a yearling!
Bowfanatic, I'm not trying to be anal here, but the true definition of a yearling is a deer between 1 and 2 years old. Fawns are fawns, yearlings are yearlings: deer between 1 and 2 years old. Is it really important (?), I don't know, but if you are talking about QDM, deer management or anything else to do with deer and deer hunting, it helps to use the proper terms to accurately identify deer. That way, when someone says yearling, we know what age you are talking about.
It also gives you more credibility to know what you are talking about when throwing around terms. Please don't take this the wrong way, it's not a slam, and I'm not picking on you or anyone else, but there is a true definition of yearling, it's not a matter of regional terminology like the 4 point vs. 8 point example.
Have a great holiday.