I've literally had hundreds of customers from when I butchered deer for others tell me they had never had properly aged venison before, and would never NOT do it again.
Some traveled an hour or more one way to bring deer in.
Without a proper cooler, an old frig or even a big ol junk freezer it's difficult unless weather is flat cold out.
Rule one (for me) is get the body heat out. That hide WILL hold the heat a LONG time if ice isnt applied.
In a freezer/ packed in ice whatever for 24 hours then kept in whatever you have that is below 40, 35-36 is better, HIDE ON, no drafts, no sunlight.
If you remove the hide the meat WILL dry out and toughen it.
A week is good for most, 10-14 days is better. Ive hung 200plus lb bucks 21 days solid in a cooler.
Aging is an enzyme breakdown of protein and since, as accurately described, deer have no inter-muscular fat, its a superior thing for deer or elk meat.
At one time BEEF was aged much longer too but the cost of doing so commercially, plus the slight loss of body weight (sold by the lb) now results in 7 days being normal.
High class restraunts that serve WELL aged, super tender and juicy beef charge much much more for this quality of meat.
Keep in mind that once the heat is out and the carcass temp is below 35, it will not warm up fast at all.
Without a cooler in just a closed garage, 45 degree days and low 30s at night on average, I can hang 2 weeks, no problem, even if one or two days hit 60 degrees.
Nothing WRONG with fresh killed venison, but it don't hold a candle to properly aged venison, neither in taste nor tenderness. Even the burger tastes quite different to me.
"life starts at 40"...bacteria growth aka ROT life that is."
my 2 cents to the pile guys.
God Bless.
PS.......washing out the carcass with water from the well isnt a real great idea if aging a long time. Distilled water if you must, I dont, period.
These rules were used for over 3000 whitetail. None "lost" never a complaint, hundreds of compliments.