https://www.macworld.com/article/673939/this-is-how-long-macs-and-macbooks-last.html https://www.macworld.com/article/673939/this-is-how-long-mac... According

https://www.macworld.com/article/673939/this-is-how-long-macs-and-macbooks-last.html https://www.macworld.com/article/673939/this-is-how-long-mac... According to this they're still supporting a 2017 IMac, 9 years is a decent amount of time. Apple can always change their minds and extend this out with security only fixes indefinitely.