Is there a way to find the age of a specific Mac?
Few ways found after searching -
1. Mac Tracker
Mactracker provides detailed information on every Apple Macintosh computer ever made, including items such as processor speed, memory, optical drives, graphic cards, supported OS versions, and expansion options. Also included is information on Apple mice, keyboards, displays, printers, scanners, speakers, cameras, iPod, Apple TV, iPhone, iPad, Wi-Fi products, Newton, iOS, Mac OS, and OS X versions.
http://www.mactracker.ca/
2.Coconut Battery 2.8
It has this nice feature which shows the age of your mac inside the App -
Calculates the age of your Mac using the coded production date in the serial number of your Mac.
http://www.coconut-flavour.com/coconutbattery/