You can just tell he has a lot more bone to add to that frame, regardless of exact age. Will be a real nice one next year, and a stud in 2.
In central wi that buck gets shot on 90% of properties. Buffalo county that buck gets passed 50% of the time. In my Iowa spot that buck has a 90% chance making it another year.
Getting a healthy population of those bucks to another year is getting into some awesome hunting. Getting 2 more years on bucks like that is world class hunting!