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[QUOTE=masraum;11482696
I believe the current version of IOS is 64-bit. I believe older versions were 32-bit (which is why you sometimes lose access to some apps after an upgrade). When exactly that change was made, I'm not sure (ie, IOS 12 --> 13 or ...).[/QUOTE]
Tiger, 2005, was the first to support 32/64 apps.
32 bit support ended in 2019 with Catalina.
Apple have always been very good about maintaining compatibility for as long as possible even across major disruptions like the move from PPC to Intel and now ARM.
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