I was also under the impression that as a deer ages it rack begins to get smaller but I don't know if that is really true or not.
oh for sure, many larger antlered animals like Red stag, Wapiti, Sambar and even fallow, they are somewhat peak by 7-8-9 years ol an then go backwards after this, * Penned Deer cast antlers over 13 years or maybe 15 years indicate this.
once their position in the breeding rights diminishes by younger up an comers, then he no longer needs a large rack an stops putting effort into growing them in velvet, or puts the nutrition elsewhere to get him thru--
alot of these older sambar go from perfect shapes, to then start to droop, smaller 'tops' or the brows just dont produce any longer tines etc.
thats why i bang on about leaving these 3-4-5 year old deer IN hopes HE continues to breed, an maybe wises right up, slips away an in 3 or so years
someone can shoot a modern day booner............ (but that is thinkin big picture not MY/YOUR own investment) but if u do the time....things can happen.
but its hard to drum that into hunters, the whole split population on just brown its down, the meat eaters and then the younger dudes who end up with 45 racks in the shed and 3 large ones in their life......
difficult for once a year hunters to Age deer on the hoof, or realise its A young (like above) or B- old n gone back- or C- in its prime...... an then D E F - alot of hunters dont give a fk either. take em or be taken by else.