This question was posed by a friend on Facebook.
My first reaction was that I own a couple of slide rules, but I don't think I've used either of them in the past couple of years.
Then I saw some bottles of after shave. I use them rarely and they are pretty old.
I have given away nearly all my books, but I have a few that I acquired back in the 1960s, including a bunch of conductor's scores. But I don't read hard copy books much, if at all, so I don't really use these.
Maybe the oldest thing I acquired myself that I still use (albeit rarely) is a maroon wide-wale corduroy pull-over thing that I bought in Chicago about 1966 or so.
But probably the oldest things that I own and still use are things I inherited:
- a clock from the early 1900s
- some bookcases from the same era
- a chair that my grandmother said had been "discovered" by her grandmother in the mid 1800s. When she got married and moved to a new town, the chair was already there.