How long something may last really depends on the material choice, but a big point for me is repairability and parts availability. If something is easy to repair and parts are readily available, bad material choices may not be so damning.
One of the best headphones in that regard is the Sennheiser HD 600 family. Can be taken apart almost completely without tools and all matter of original and third party replacement and modification parts are available. Plus the only thing really failing on them over time is the foam in the pads, but that goes for almost all headphones over time.
Here is my HD 600 with a new headband pad, it's about 20 years old:
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