Since no one has opined on how long a wet suit lasts, let me suggest that the answer is "it depends." Wet suit life depends on number of hours in salt water, number of hours in fresh water, and how well you clean it after use, and how you store it after use. With each use, the neoprene will break down a little, and become less effective as a heat loss shield. You can slow that process by a thorough cleaning after use with any of the products available for that purpose, and by storing in a cool dark place. Heat and sunlight also break down the neoprene. However, even with proper care, your wet suit will become less and less efficient. I have found that about 200 hours in salt water results in an easily noticeable loss of thermal effectiveness. For lesser quality products that number be be lower. Even a casually used wet suit will break down with time, but can last for 5 years or more if properly cleaned and stored. I learned here on scubaboard that after thorough drying it ist is better to roll the suit for storage than to hang it. That has proven to be a really good tip to preserve the effective life of a wet suit even more.
I have never purchased a used wet suit for myself or my wife, because it cannot be know how it was cared for or stored. Even a "like new" wet suit that has been stored with ocean water residue permeating it, or hanging where the sun hits it, will not last as long as it should if properly cared for. SO think carefully when buying a wet suit, because the real value will be "cost per dive" the suit will give you, not just the starting price .
DivemasterDennis
I have never purchased a used wet suit for myself or my wife, because it cannot be know how it was cared for or stored. Even a "like new" wet suit that has been stored with ocean water residue permeating it, or hanging where the sun hits it, will not last as long as it should if properly cared for. SO think carefully when buying a wet suit, because the real value will be "cost per dive" the suit will give you, not just the starting price .
DivemasterDennis