Bikes, some items of clothing, furniture, DIY/garden tools, pretty much every kitchen utensil and gadget could be handed down after that period of time if it's high quality. A lot of electrical stuff like radios and TVs are still useful after 20 years.
Like my incandescent light bulbs? Plenty of things should not be kept around for twenty years simply because their replacements are better for the environment. At a certain point the accumulated impact of an old thing will exceed the impact of making and operating a new thing to replace it.
While I agree with your other examples, I think power tools are a bad example. I'm using a wired drill and circular saw from 20 years ago, which both still work perfectly. How is buying a modern power tool which requires disposable batteries that 99% of people will dispose of improperly a better choice for the environment? My guess is that the industry shifted toward batteries because of convenience, not efficiency, but I could be wrong.