If you look at the "stickied" thread at the top of the QDM Forum "Field-Judging Buck Age examples" all of the pictured bucks except one (the summer-time velvet buck 6 1/2+) were photographed on my property.
I would have to add them up, but I've probably photographed 150+ individual bucks 2 1/2 or older on my place over a 10-year span. Now I've got literally thousands of pictures of bucks from clients properties in TN, KY, GA, MS, and AL, but considering they paid for that data to be collected (or collected it themselves and paid me to analyze the data) they own the data and I don't post those pictures publicly. However, I'm always happy to share the data I own.
When it comes to aging bucks the characteristic I put the most faith in is the size of the neck, especially the neck/jaw-line juncture and the neck/shoulder-chest juncture. Secondly is the depth of the chest/shoulder and the relationship between the depth of the chest and the length of the front legs. The older a buck gets the "shorter" their front legs look in relation to their chest. The size/shape of the hams can also be useful, but I find this to be one of the most variable features.
As for antler development in TN, the vast majority of my antler data comes from the the ridge-and-hollow hardwoods west of Nashville to around KY Lake. Primarily the Hickman, Maury, Perry, Humphreys, Houston, Benton County area--because that's where the vast majority of my client's properties are.
But from all that data, the average gross antler scores by age are:
2 1/2: 80-85
3 1/2: 105-110
4 1/2: 115-120
5 1/2: 120-125
Of course, these are averages. The range of potential scores per age-class is huge, being 100 or more gross inches at 3 1/2 (a 3 1/2 year-old buck can be anywhere from 50 to 160 or more) and being even wider by 5 1/2.
But what I find most interesting about my average antler score per age-class data is that it almost perfectly matches the average antler score per age-class data collected on the King Ranch in TX. TN bucks may not grow the antlers Midwestern state do, but we can match South TX.
Now if we we're talking about the best areas of TN, say Williamson County, I would add 10-15 inches to each average. And from what I've seen from KY pictures, I would add 15-20 inches to each average for south-central and southwest KY bucks. For instance, I would feel very comfortable with a 125 gross average for 3 1/2 year-old bucks in KY.