Field Aging of whitetail Deer

What are the different ways to age whitetai deer
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What some Biologists say about it.
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courtesy of DeerAge.com 
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Shot Placement & Selection For Deer Hunters
Knowing well ahead of time what represents a good first shot will make you a more aggressive and successful deer hunter. Knowing when not to shoot will make you a more ethical deer hunter. Many of us focus on the horns and not the shot placement for a humane harvest.
The maturity of a deer hunter can better be judged by the kinds of shots he passes up than the size of the bucks he has taken. These tips are designed to help you evaluate every situation and knowing a good shot from a marginal one. Making the right moves and taking the best shot at the right times requires pre-planned actions.
BROADSIDE SHOT (bow and gun)
Gun hunters can drop deer instantly with a broadside shot by putting a bullet through the shoulder blade. A well- constructed bullet will pass through the blade and the spine.
The broadside shot is also good for bowhunters, but it doesn't leave much room for error as the quartering-away shot does. Arrows that pass through the vital organs produce quick, clean kills. Aim for the heart, knowing that a high shot will still hit the lungs. Archers must avoid the shoulder blade.