Hey Pete! I'm sure not an old guy, but when it comes to Macs I am. Been using them since the late 80s when I was but a tyke. My dad got me hooked young while he was getting his PhD at Dartmouth. He had a Macintosh SE/30 for doing his work on, and of course a couple sweet games like Lode Runner and Arkanoid. Anyway, I used the OS all while growing up, and when I hit about 10 and we got our first Power Mac with a color screen (7200/120), I really started trying to learn all I could about the internet and stuff. So, here I am years later, having been shouting it from the roof tops this whole time, Mac OS is the way to go!
Welcome, and any questions, don't hesitate to ask. We've got pretty much everything covered between the people in this community.