I have hunted whitetails for 40 years.
I regularly hunt 3 States a year. And several different counties and WMA's within Tennessee (my home State).
I typically sit a stand between 70 and 100 times per year total. And spend much more time before and after the season looking at trail cam pics, through binoculars, through the windshield, and on the ground scouting, most on public lands.
And I can tell you this with great certainty.
As far as age is concerned let's be honest with each other. NOBODY CARES when the buck is a 3 year old if it looks like the MILO HANSEN buck (arguably a 3.5 year old)
NOBODY!
So in the end, if you wish to live to be and OLD buck, wish to be a healthy deer, with very small antlers. and long legs, because most likely everyone will think you are young and probably will give you a pass.
And if you guys don't believe me about how difficult it is to make "blanket" statements about buck age...try to age a doe on the hoof. FORGET IT!
Some of the oldest does I've killed were tooth aged 4.5 plus and had tiny bodies.
I'll never forget one was a 4.5 + year old AEDC deer that dressed 58 pounds.
And yet I've killed and seen several bucks that dressed over 150 that were young looking!
I do believe there are fawns, and 1.5 year olds that look and act certain ways that are clues to their age. But teaching how to spot these characteristics would be very difficult.
I've also seen gray muzzled, scarred and fat, saggy belly and short legged very old looking deer that biologists at the check station declared were 3.5 year old deer!
Having trail cam pics of deer with distinct characteristics for several years is hard to beat. But even this can be a year or two off.
The Craziest deer kill ever was actually a buck we KNOW was at least 3.5. He actually had a better rack at 1.5 than at 3.5!
Everyone seems to be so hung up on age. In reality, (let's face it) it's antler score!
Really big racked deer, even if they are relatively young, rarely get a pass on public.
So just try to enjoy your hunt. Enjoy the whole hunting process. Kill (legally) what makes you happy.
Quit worrying about what other hunters do or think because they have their own agenda, as they should.
And above all remember this, deer hunting in itself is NOT an exact science. Even though some would want you to believe it is. Very little of the information in and around the process of the hunt "fits into any kind of box".
Even though "celebrity you tubers" would lead you to believe that they have answers, they probably do not have near as many as they think they do!
In fact, there is probably MUCH MORE MISinformation on youtube than solid good information.
And what hunters do in one area (of the United States, or County, or area in that county) may or may not have anything to do with the herd your hunting!