I currently have yosemite operating system. can i upgrade
Can i upgrade operating systems
iMac 27″, OS X 10.10
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The model year of an iMac is available at Apple menu > About This Mac.
A late 2009 through mid-2011 iMac can be upgraded to High Sierra 10.13.6 but no later version. See: https://support.apple.com/en-us/HT211683
A late 2012 through late-2013 iMac can be upgraded to Catalina 10.15.7. See: https://support.apple.com/en-us/HT211683
A mid 2014 and late 2014 can be upgraded to the current version of Big Sur. See: https://support.apple.com/en-us/HT211683
A late 2015 or later can be upgraded to the current version of Monterey. See: https://support.apple.com/en-us/HT212735