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Solar modules deployed in France in 1992 still provide 75.9% of original output power
(www.pv-magazine.com)
This is a most excellent place for technology news and articles.
If that became a problem, every old panel could be changed by newer ones and the old ones could be installed in a desert until their EOL.
Right, they could be installed in the middle of nowhere as free phone chargers and stuff even if there was no other use for them. Just set them up with a used inverter and some used chargers, whatever etc.
Or maybe a whole lot of them could be put together in the middle of nowhere to make an EV charging station