I'm pretty sure he's 4. He spent his summers around my neighborhood on the edge of town and I first noticed him in 2018. I didn't really take the time to take photos of him that summer but I do have a couple. His body is a little bigger than his buddies, so maybe he is a year older than them. Maybe he is the same age and is just a bigger healthier deer. From my experience, it seems like bucks tend to hang out with bucks that are the same or similar age, so I'm calling him 2.
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This is him the next year in 2019 when I think he was 3.
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This year at age 4 he turned into this.
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This is a classic example of what could happen if more bucks with the right genetics made it past age 3 in Montana. If he lived out of town on public land, he likely would have been killed at age 3 and we would have never got to see him make the big jump at age 4.