Everyday tools? Scissors and knives I've had at least since 2000. (Fiskars stuff is indestructible)

Computer stuff? My Commodore 64. (Don't use it daily but pretty regularly, sits in a box in my living room for easy access)

I have a teeny tiny screwgate carabina from about 1997 that I use as a key ring.

My teapot probably from the 1940's

Still using my microwave from my wedding. It's from 2009 and it's a Panasonic. Also my Kettle is from around that same time too and still chugging along, it no longer beeps though.

My dining room table was originally owned by my great grandmother and was passed down through the family and transported almost 2000km to it's current location in our house.

Until last year I used a ski coat from 1940 as my winter coat

I use a nice handmade wooden desk every day. No idea how old it is but my mom bought it at an antique store in the 70's, so it could be 80+ years old. And it's still in fantastic shape!

Edit: I heard back from my mom and she said it's (supposedly) from the late nineteenth century, so it's way older than I thought!

My razor handle was manufactured in the 50s

A great-grandparent's dresser.

My car and also my scooter are from 2009. I use them (for commute) alternately depending on which season it is and if it's raining or not.

We've been living out of backpacks on the road for the last ten years, so it's easy to keep track of your stuff... Only item in our bags that hasn't changed is a zip-up flannel towel. It's perfect for keeping your toiletries in order, light-weight and washable, doubles as a flannel on the rare occasions you need such a thing, and has Hello Kitty on it.

Since the bags themselves have been replaced, it's the clear winner. 2nd place is a Tony the Tiger colour-changing spoon from a bag of Frosties in 2016.

TI-83 plus

Two things come to mind.

My recently acquired Technics hifi system from the early 2000s from which I listen to the radio, my music tapes and my CDs.

And my old Telefunken HDTV from 2006. It's remote doesn't work anymore but that's okay.

I think the apt. building I live in is from the 1920s or so.

I have the metal 'polenta spoon' that my great grandparents brought to the US from Italy in 1896. I don't use it, but it sits in the utensil bin by my stove. No idea how old it is or why it was deemed important enough to bring on a boat.

Oldest thing I use frequently may be a 100~ year old ring.

Probably my razor, shaving brush and soap mug. Bought them around 2012.

The soapmug is an Old Spice mug I got second hand off ebay. Not sure when it was made. 80's maybe. The others were bought new.

I wet shave. Ordered a vintage Gillette Fat Boy from the 70s. Definitely my oldest personal item. I've had it only about 10 years though.

In terms of actual daily use the oldest thing that I can actually date would be the table my computer sits on - that's been in the family since at least the 60s (when one of my uncles scratched his name into the drawer). It's just a basic solid wood desk, still holding up fine and unless abused will continue doing so for quite some time yet.

Aside from that some of my dinner plates are over 30, the motorbike I usually commute on is a '97 model, and the butter knives I like are not dated but I believe could be anywhere from early 1900s onwards (faux bone handles, made in England with various Sheffield makers marks).

I do have a few tools, cameras, and telescopes around which are also reasonably old but they aren't daily use items.

I have several vintage film cameras I use pretty often, oldest are probably my Nikon F or Leica M3 from the late 50s.

My mom bought me a little Leatherman squirt on my birthday in 2010 and I've been carrying it ever since. 15 years on it's still my most consistent EDC Carry.

Fender Stratocaster, bought from a Best Buy musical instrument department probably 19ish years ago. Just put new strings on it yesterday and continued learning Dokken's In My Dreams. Fuck that second part of the solo..

I have some old wooden chairs at the dining table that could be old. Certainly before 1940s.

Hmm, probably cookware from the 1960's. Furniture too, if that counts. It's possible something in the kitchen is actually a generation older, although I'm not sure.

If you include decorations as opposed to just tools it goes back almost arbitrarily (I have 19th century heirlooms, pre-settlement arrowheads and Cambrian period fossils), but I think the spirit of the question is more about things finding a totally pragmatic application.

Edit: I also have a touch-sensitive lamp of a similar age to the cookware. I'm not sure how it works exactly, but I'm guessing the entire exterior is one big capacitor, and it must have a very early transistor inside to switch it. It's not quite used daily, but it's sure interesting.

Probably my Ron Jon Surf shop beach towel I got while on holiday in Florida in 1997 (I live in the UK). Still in great condition and I wouldn't say I've looked after it particularly.

Also honourable mention to my oldest tech which is an HP touchsmart 600 PC I use for youtube in my bedroom, it's from 2011 and still just about hanging on.

I have a washcloth I got when I was like 6.. I’m almost 40. It’s a really nice mesh washcloth and somehow it only has one extra hole that shouldn’t be there, as well as a seam for the edging that needs to be fixed.

I’ve used it almost daily for my face that whole time.

But the oldest thing I have that I sort of technically use is a wheelchair from WWI. It functions as a chair in my living room. I don’t really think it counts, being furniture, though.

I have a 1973 Gibson ripper bass and a 1971 ampeg svt v9 with a late 70s 8x10 ampeg cabinet. I don't use them daily but more than twice a week, they both still work perfectly. Just regular maintenance

Maybe the iron skillets. I don't think a day passes that I don't use those. Or my house, it's from the 1940s. Some of the furniture is older than that too, though I don't think there is any one piece I actively use each day.

Truly oldest? Double entry accounting, I use nearly every day and that's from around 1300.

I have a stove that is a little older then me. I have a cheese grater that no one in house kniws where it cane from or when we bought it. I have a towel i go in the 90s on a trip. That's about as old as a robotech art book i have kept since around then. And I have my grand father's dresser. Not sure how old that is