Big track = big deer. As Bone indicated, a bigger buck tends to be an older buck. So, there is a correlation with age of bucks (not does, which achieve maximum body size by 3.5 typically). However, there is variability in body size of adult bucks, and a big young buck of the same weight as an older buck will have a track of about the same length - though the young guy's toes may be more pointed (as Bone pointed out).
I'd get very interested in any whitetail or mule deer with a 4"+ track.