I have an old Imac, What OS version should I update to?
I have an old Imac, What OS version should I update to?
iMac 21.5″, OS X 10.11
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How old? The model year of an iMac is available at Apple menu > About This Mac.
Personally, I would upgrade to the latest possible version. Note that if you update to Catalina or later you will also need to update any non-Apple 32 bit apps if you have any. Reply for more information if Catalina or later is possible.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version. See: How to download macOS - Apple Support
A late 2009 through mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version. See: How to download macOS - Apple Support
A late 2012 through late 2013 iMac can be upgraded to Catalina 10.15.7 but no later. See: How to download macOS - Apple Support
A mid 2014 and late 2014 iMac can be upgraded to the latest version of Big Sur macOS 11 but no later. See: How to download macOS - Apple Support
A late 2015 iMac can be upgraded to the latest version of Monterey macOS 12. See:How to download macOS - Apple Support
A 2017 or later iMac can be upgraded to the current version of Ventura macOS 13. See: How to upgrade to macOS Ventura - Apple Support