Loc: The last LF ranch in S. Texas
He may be older than 4.5 with that roman nose, pot belly, swayed back, sagging chin, and he is clearly bigger in the chest area than any of the deer in the picture. I'm saying 5.5+ and I'd take him because I doubt he will get much bigger horns than he already has.
Id say your in the ball park. Like someone else said, this time of year is tuff on aging. Also not every deer is going to age the same. Some are feed hounds and are rolly polly their whole lives some are long and lean etc.