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Are you saying all DC fans only live for about 3 months???
Or are you saying if I downvolt, THEN it will only last 3 months???
Cause im sure there are some people out ther with 12v pumps that have lasted a LONG time...
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If the DC pump relys on a seal on the drive shaft (direct coupling to the impeller) than it will have a limited life, either the seal will eventually fail flooding the internal workings, or the brushes will simply wear away. It's not going to be axactly 3 months, but that seems to be a rough average.(continous run time) down volting it will make it last a bit longer (less wear v time) exactly how much I wouldn't know.
note; I'm refering to brushed dc motor based pumps here, brushless fans and mag coupled pumps have a far greater MTBF.