How long do brake pads last in storage? I’ve discovered in my parts box some rim brake pads that have been there for several years. Aside from age, they are in fine shape (some are new). Can I put these on my bike, or is there hidden damage?

In other words, how long do stored rim brake pads remain safe?
I have already bought some pads that the LBS had for more than 4 years, and they work perfectly. I think the specific compounds from which brake pads (and tires, most probably) is not prone to self-degeneration if stored in a "normal" environment.

So, the suggestion would be to take a ride and check if the pads brake well. If so, use normally.