Many graphic design professionals stick with older software, and hardware. I still use CS5 on Win 7, although I'm no longer actively pursuing career in the industry. I know a renowned typographer who still uses FontLab (v5 I think?) on a Power Mac G5. The reason usually being familiarity with your tools. It's very similar to photography: it takes years getting to know your camera to the point when it becomes the extension of your body and brain, despite what marketing people say.