“Every new version of OS X comes with harsh news for owners of older Macs: ‘Your Mac is too old. You’re stuck with your current OS. Forever,'” Chris Rawson reports for TUAW.

“For Mac OS X Leopard in 2007, anyone who owned a Mac with a processor slower than 867 MHz was stuck with Tiger. In 2009, Snow Leopard made the biggest (and most controversial) shift yet and dropped support for all PowerPC Macs,” Rawson reports. “In 2011, Lion dropped support for Macs that didn’t have 64-bit Intel Core 2 Duo processors, which included most of the first-generation Intel Macs.”

Rawson reports, “The march of progress continues in OS X Mountain Lion, and with it comes a new set of minimum requirements. An anonymous developer clued us into the minimum requirements for OS X 10.8, and there’s bad news for some older Mac owners. Mountain Lion will only run on the following Macs…”

See the full list here.

[Thanks to MacDailyNews Reader “Fred Mertz” for the heads up.]