Chosen Solution

determine year MacBookAir was built?

In addition to two other fine answers here, you can go here to all the information on you Mac with the serial number: http://www.everymac.com/ultimate-mac-loo… This site tell’s you the finer details of your system: RAM, processor, hard drive and upgradability.

You need your serial number and follow the directions in the link. On most computers with Mac OS X, you can find the serial number in the About This Mac . https://support.apple.com/en-us/HT201300

Hey Terry, Go to Apple Logo on the top-left corner, click on “About This Mac” and the MacBook Model/Year should be listed right below the OS X Version. Best of Luck!