I also wonder that in the case of T-72s. Arty ammo are more durable. IIRC Finns used their WWII stocks in arty training up to late 90s or early 2000s.I wonder how many of those stockpiles of tanks and ammunition were properly maintained and preserved. I wonder if the arrival of the T-62 demonstrates a shortage of T-72s.
I imagine if M1 Abrams started to be replaced with M48 and M60 tanks the local lads would be wondering what the heck happened to their first rate tanks.
On the other hand at the end of one exercise our staff sgt said to me "We are not carrying those pre-war Italian propellant charge bags back to our base, are we? So take your section and do something to them." So I did. I was a sapper/combat engineer corporal. Because we were traditionally nearer to German Pionier than Anglo-American sapper/combat engineer our training was more combat and less engineering oriented, in fact our duties were very much same as those of 1944 British Army Assault Pionier. That happened mid 70s, so those propellant charge bags were some 40+ years old, still gave a bang but probably not as big bang as in early 40s.