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Speakers sometimes die while sitting unused in their original shipping carton in a dry, climate-controlled room.

The adhesives can age. Foam surrounds can disintegrate. (Ask a Bose 901 owner about foam rot.)

They also can also die from use, and abuse. And finger-poking. And environmental conditions like moisture and UV light.

I know enough enough about old speakers to know that lasting forever isn't one of their usual traits.

Are stethoscopes really as bad as that?

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My first stephoscope lasted about 10 years until the tubing became brittle and started cracking. It's the oil on your skin that does it apparently. It went through a couple diaphragms and I lost an ear piece but used a replacement one.
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As other commenters pointed out, rubber/plastics fail.

Littmann sells repair kits.

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Fair enough. My medical classmates regularly used stethoscopes that were purchased by their parents for the parents' own studies but I understand there may be differences in build quality.
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Stereotypical image of the doctor is that they carry them over their neck 24/7, so that alone would destroy them pretty quickly.
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