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Wetsuits seem to have a lifespan of about 3 years or 300 dives, whichever you reach first. The neoprene doesn't fully rebound after being compressed repeatedly, so depth kills them (even relatively shallow depths). Second, as the rubber ages, it stiffens and cracks, and again, the little bubbles that were keeping you warm get smaller and less effective.
There are exceptions to this, in particular the old school wetsuits made from Rubitex rubber can last decades and still be warm. They're pretty hard to find today, though (only a couple of places still make them)... most modern wetsuits use comfy stretchy neoprene... with a short life span.
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