Counting furniture, our bookshelf (mostly taken over by me) is probably little older than myself.
I also have at hand my uncle's old Finnish-English and Finnish-Swedish dictionaries that are from 70's.
Then again it's hard to say what's really "mine" (in my use, given to me as child, bought myself?) and what counts as "use" (annual, monthly, weekly, daily?)
I just realized behind me is a wooden box (acting as living room table) that beats those on decade or two, but again, I don't own it.