My bow hunters reliably (to my estimation) know the age of desirable bucks on our farm. They do this by having game camera pictures of the same buck year after year.

Maybe some dedicated trophy hunters here can confirm this practice or profess that its a bunch of hooey.

"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]