When I was born, my family had an old Epson PC running MS-DOS. It was too complicated for my mom to learn, so my dad was pretty much the only one who used it.
When I was 2 years old, we got a brand new HP with the new Windows 95. My dad pretty much had me on the machine for most of my young life. He wanted to make sure I knew how to use it, because he was sure computers were the future. Well, by the age of 3, I could navigate Windows just about as well anyone could at that age.
At the age of 6, I was introduced to Macs in kindergarten. The computer labs were full of All-In-One PowerMac G3s, with some older AIO PowerMacs, and a few LC II's and III's in some places. Halfway through the year, the school upgraded to the brand new iMac G3's, the Rev.A Bondi Blue. I was very intrigued about this new OS, as I thought Windows was what everyone used.
Eventually I moved away from that school into one that used PC's. But the "damage" was done.
As for home, I had gotten a locally built computer from my grandfather running Windows 95 when I was 6. Got an HP Pavillion running Windows 95 from the same grandfather when I was 8. Stepdad bought me a brand new HP Pavillion running Windows XP when I was, which I used until I was 13. (I might note that it had two motherboard replacements, one graphic card replacement and two re-installs in those three years. It was enough to make me hate PC's for a while.)
After that, I bought a few older Apple's, a Mac Classic, the same model iMac G3, an Apple IIc. Finally got my first brand new Mac, a Mac mini in 2006 and the rest is history.