FFS here we go again! perpetuating the MYTH that electronics wear out like some machine!

The only thing that is likely to suffer are fans because they are mechanical.
Until you can explain at the material level what changes with age, be quiet.
24/7 operation is not a reason.
Running at 100% is not a reason (unless you're an idiot you will be under clocking and volting to reduce power)
heat cycling is not a reason( for one thing mining gpu aren't cycling, they run at steady temps)

So enough with the irrational paranoia, and anyway you will be upgrading before any gpu's run long enough to wear out

Baz