A vast mjority of our objects are 20+ years. I can think of:

• Books. Most are form the 19th century, quite few are much older than that. Some more are from the XXth. I have a few from the XXI too, but they're the minority ;)
• Bookshelves. They're your standard Ikea but they must be at least 20 years old.
• Some of my notes and manuscripts are 35+ years. I still use reading notes I made back at university in the early 90s.
• A few CDs and probably DVDs too.
• My FM radio is from 1995, or so.
• My thermal typewriter is from the late 80s, still working wonders. My mechanical typewriter is from my grandfather and must date back from the 60s.
• Our dining table. It too was inherited from my grandfather, who already got it as an antiquity (it's worth nothing, I just like it a lot: it's so well crafted it's a joy to look at that craftsmanship)
• A few of my fountain pens.
• One of my two watches.
• Plates and silverwares.
• Heck, even our oven is 40+ years old (still working great).
• Tea pot and kettle.
• My Victorinox pocket knife. Must be at least 45 years old.
• My grandfather's chess pieces (the one he made to play chess, while he was a war prisoner in WWII Germany) with the chessboard he sketched on the back of a large sheet of paper.
• My own set of chess pieces and chessboard.
• My portable Kasparov Advanced Trainer is from 1988 or 89, I believe. It's much less powerful than any recent chess engine, but unlike most contemporary electronics it is still working perfectly after all those years.
• A few pictures of me and my spouse, not much as we're not obsessed with photographing ourselves. Some photographs that photographers friends offered me or that I purchased along the years.
• Last but I hope not least, my spouse and I :p