Swiss army knife, about 25 years old.
I love the new math.
Me, too. Antique four-poster. My mom inherited it when her grandmother died in 1988 (I was a few months old) and passed it on to me last year, along with a wingback chair that’s about as old. I’m guessing it’s from the 1890s or so. It used to be in the guest bedroom when I was really little, then they took it down and put it away when my brother was born and they needed the space for him.
My dresser dates from approximately 1860. I believe I’m the seventh generation in my family to use it. It is quite solid, and comes with a bullet hole in one of the drawers from it’s log cabin days in rural Kentucky.
We have a number of cast iron pans and a couple good chef’s knives that we got from Rhiannon8404’s grandmother. While I couldn’t tell you if we used a particular individual piece 5 days a week, we use at least one of those pieces every single day. They must be 70-80 years old at this point.
My house was built in 1952, and still sports the original wooden toilet paper rod painted to match the tile in the bathroom. Used it today!
My silverware, although I admit I don’t use every single piece every day, I rotate when they get dirty 
I’ve never bought silverware so the latest I could have gotten them is when I left my mom’s house 14 years ago – they are probably a lot older.
My house is from 1954 and my stove is from about the same era.
My silverware.
When I moved out into my first apartment, my mom gave their then 20-something year old set and upgraded. That was over a decade ago; I’ve never gotten around to buying a new set.
I’m still eating off of the forks I learned how to eat off of.
I’m sticking with oldest inanimate object that has been mine continuously for the longest time.
A Hitachi rice cooker (with bell) that we received as a wedding gift 28 years ago this month.
That’s weird. My house was built in 1870, and it’s only 141. Huh.
A sleep mask that I’ve had for almost 10 years. IIRC I got it at the Sharper Image (or one of its knockoffs), but they discontinued it several years ago. The elastic keeps losing its elasticity, so I occ. have to readjust the velcro on it; I’ll wash it c. every 6 months. I simply haven’t found one just as good-comfy, conforms to my face, keeps stray light out.
I have items that I use that are older, but the oldest thing I use frequently is my fork. It’s a stainless steel fork with the NAAFI emblem stamped on the handle. It’s probably 50 years old and I have used it for every.meal at home for the last 25 years.
My car. Eleven years old. I have much older things (mostly books), but that’s the oldest one I use every day. Though actually, I wouldn’t call it “use” but I’ve never taken out an earring I had pierced on 4th July 1996.
(Incidentally, Americans are cute with their “old” houses!)
Lots of old stuff that I use here, but it it has to be an every day item, it must be my toothbrush glass in the bathroom. It is pink pebble-glass and I’ve had it and used it for a good 45 years. It is the first and only one I have. My mother laughs every time she sees it as she bought it for me when I was a wee mite.
The ugly green chairs we use at the table are from about 1830. The table we use for the laundry stuff is around 1820, and has come down through my wife’s family since that time. I’m not sure about the desk I’m typing this on, but it is a fold up desk with a secret compartment. Very similar ones show up on Antiques Roadshow, and I think it is pre-Civil War.
I got my nightstand when I was about 5, so that is 55 years old now. My wife’s parents got lots of antiques, and we’ve inherited most of them.
Fountain pen from about 1918, made out of black hard latex rubber with a gold nib. A wonderful writing and drawing pen. I bought this pen last year, so it is new to me. I also have a small triangular cabinet I keep fountain pen inks in that sits on my desk, which I inherited from my uncle-in-law and dates to approximately the same period. I possess other old inherited objects like a civil war cavalry sword and an early twentieth century slide rule, but they don’t fit the criterion of daily – or any – use.
Acid Lamp and I have a Chinese opium bed we sleep in every night that’s about 180 years old. Still sturdy, still cozy, but an odd size between full and queen means we’ve got a futon mattress and thick memory foam as our padding between us and the wood frame.
Just about everything else in the house is fairly new; the next oldest thing I use every day is my desk, which was built in the early 1970s.
Very cool.
For me, I think it’s got to be my kitchen table. Enamel with leaves, very like this one. No label or date, I think it’s from the late 30s-early 40s. I got it from my grandma, who got it from my aunt who got it in a junk shop in the 70s. I have lots of older books, kitchenwares, clothes and tchotchkes, but none of them get used more often than weekly. I have some printmaking and binding tools that date from the 1890s too but again they don’t get pulled out that frequently.
Come to think of it there are some amazing old tables at work that date from various points in the 19th century, but again I don’t sit at them daily, more like weekly for meetings and such.
I don’t know. The only thing I can confirm the date it was made is my Rhodes Stage 73 piano from 1976. I can verify it gets at least a few notes on it every day. Maybe my turntable’s a little older, but I don’t know – the cartridge isn’t, though, so I won’t count it.
Probably a table I use is pretty old – as in pre-WWII, but who knows. Some books, LPs, (and 78s duh!), sure, but I can’t guarantee I use those specific ones every single day.
Only other candidate – some old-style All-Clad pots and pans (with no cladding on the exterior), but I have no idea when they were made (probably in the 80s), and an ancient cast iron skillet, but I don’t use that one every day.