[pmontra]

More anecdotal evidence.

I have two very old SSD. They are the 4 and 16 GB SSD of the early EEEPC 900 Linux version https://en.wikipedia.org/?title=Asus_Eee_PC#Eee_900_series

Needless to say, that netbook stays shut down for months but it still works when I turn it on. It survived many summers at 30 C. I don't know which kind of SSD it contains but being from 2008 it shouldn't be anything too fancy.

[acqq]

As I've said, the older SSD (technologically) and the lower capacity it has the better retention is expected. My 256 MB USB stick also still works, but one I've bought much later, 16 GB, died after only one summer of being not used. And that anecdote too really doesn't prove anything. The worst events are when just a few bits are changed and you don't recognize. Then a few bits more are changed... etc