My two cents - I have hardly ever updated my Nvidia drivers and often have used the ones they shipped with until I get a new fx card. Don't see how they can "wear out" over time like a lawn mower engine. If they aren't broke . .
I am of a similar opinion. I use the drivers that come with my card or perhaps drivers a few versions newer, if there was a known issue with the original drivers or the older drivers were found to be restricting the performance of the card. Nvidia's claims of faster performance with each new driver are usually with new games, not with an old flight simulator such as FSX.