Napa tools use to be made by Danaher I think, but their new Taiwan tools are now made by somebody else, so they are not warranting any of the old stuff, even the old "New Britian" stuff, and that was LT warranted too.
Warranty???
I have several Snap-On tools, that I have purchased in the 80's. I am not a pro-wrencher, and to be perfectly honest I do not feel that I have gotten my full monies worth out of those tools to date.
I have broken extremely few of them (I never abuse them!), but if another breaks, I expect a full replacement.
I don't see it as the age of the tool, I see it more as the use, and I'm sorry to say, I have seen more "Professionals" abuse their tools, then guys like me.