Bullet proof vests, racing harnesses, etc, etc, all sorts of safety critical fiberous stuff like that ages out long before the fibers are degrading because the

Bullet proof vests, racing harnesses, etc, etc, all sorts of safety critical fiberous stuff like that ages out long before the fibers are degrading because the manufacturers make assumptions about the lifetime of the product in chemically harsh environments (for obvious ass covering reasons) and assign it an expiration date and users are not willing to say "well I use the product in a cool dry basement so I'm sure it's fine to go 2x the expiration" and accept the responsibility themselves so these products get replaced/recycled at a very high rate. As others have stated, kevlar is also used in all sorts of other applications. The material can come from wherever.