Bguy7
The Dragon Lord
I can't imagine Pokemon based off inanimate objects getting old and dying. I think Pokemon like Voltorb are probably biologically immortal...as much as it can have biology
And what would possibly lead you to that conclusion? Just because said Pokémon looks like an inanimate object, doesn't mean it's anything like said item. They'e still biological creatures, and that pretty much always mean they have a finite life. Saying they shouldn't die is like saying a walking stick shouldn't die because it looks like a stick.
To be fair, maybe there are some that don't die naturally, especially the Ghost-Types that are spirits possessing objects, like Honedge, but those are almost certainly exceptions, not rules.