I was in Kindergarten in 1995, about the time I began to learn about programming from my kid's V-Tech laptop that came with a version of BASIC. My uncle gave me an old 286 laptop that booted DOS and QBASIC off of a floppy, and this was at a time when Windows 95 was out and on our home computer. I also had a lot of exposure to 68K Macs at school and fell in love with them.

Computer skills are computer skills. If you threw me an operating system I'd never used before, I could figure it out. I understand how a mouse works and the basics of a computer from using them all my life. If the kid learns how to launch programs, save files, and check his email through a 68K or PPC Mac, they can easily figure out how on a newer platform since it's still the same concept. It's just OS X dock vs opening the folder and double clicking the icon.