Hah, same for me, OP.
The backpack I still use now in my 5th year of college, I know I had in 9th grade of high school. Don't remember if I had it before 9th but possible. The zipper busted way back in like 10th grade or so, so it doesn't actually zip up, so all this time I just used it anyway. Haha.
Don't know how old my wallet is but around 8 years is likely!
Got my 83+ for Algebra 2 in 9th grade... still use it as a senior in Computer Engineering and it works good enough for me (haven't had a huge need for a 89, contrary to what most people say).
Got a Samsung 900NF CRT back in the Onvia days... possibly 2000 or so. I used it until mid 2005 when I got a LCD, gave it to my parents then, and still in use today. CRTs generally start to wear out after that much use, but damn that thing is perfect like day one, last I seen it anyway. Awesome monitor; great resolution and refresh rates for a 19" (1600x1200@85 Hz!).
Have a ~6" fan that clamps to a desk for a long ass time. I finally bought a window fan this year but I still use that little fan all the time in the summer. Now get this... the original reason for purchasing that fan was I had a Voodoo Banshee, and to get decent performance in whatever I was playing at the time (right after HL1 came out I believe), it had to be overclocked quite a bit. It didn't have a fan, only a heatsink, so I kept the case cover off and had that little fan pointed at the video card... worked pretty well!
Probably have some more stuff that old too. I'm pretty cheap so I take care of things and keep my stuff for a long time and generally don't bother replacing it till it's hosed, as is the case with my wallet, backpack, and calculator, even with how cheap a wallet is.