Are older Macs still secure?

Are older Macs still secure? Your older Mac will now be able to keep up with the latest security updates. Although firmware updates are not included (those are model-specific, and Apple only releases them for supported Macs), your macOS will nevertheless be much more secure than it was with the old version of Mac OS X you were running before.

Your older Mac will now be able to keep up with the latest security updates. Although firmware updates are not included (those are model-specific, and Apple only releases them for supported Macs), your macOS will nevertheless be much more secure than it was with the old version of Mac OS X you were running before.