A tank in a non-use situation would only have the ability to last longer only if the tank was completely removed of water which is very hard to do.
Tanks are designed to not last; no matter what size tank you’ll always notice that they are never heavy in correlation to their size.
Thin metal that isn’t protected from the aggressive water that slowly eats at the metal and the connection to the membrane that when deteriorated the bladder loses the battle to keep air separate from the water side.