Talking about the overall lifespan of a solar panel it may live up to 25 to 30 years depending on the installation conditions and type of material used for its production.
Monocrystalline solar panel lifespan.
For instance if you have installed monocrystalline panels you can continue to use them without any issue for more than 25 years.
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On this parameter of lifespan polycrystalline solar panels are not very different but the warranty period offered by the manufacturers may vary.
Monocrystalline solar panel manufacturers will usually offer a 25 year warranty because of the longer lifespan of the product.