I don't have anything older than about 13 years due to bastarding OCD.
BUT my mum has LOADS! Mainly Tupperware which she bought as a new wife/mum in the 70's, the usual tubs etc but also a very 70's orange mixing bowl, boiled egg slicer and apple corer/slicer (how is it still sharp?!), a "good" branded bread knife I forget the brand but nobody but mum is supposed to use it but we do - again still incredibly sharp and I don't think it's been sharpened.
She had the same fridge and washing machine at one point for over 30 years till they finally gave up the ghost.
On a safety note a pp mentioned a microwave. Dad made mum get rid of her old one ages ago, apparently older ones may appear to still be working fine but can leak radiation so it's advisable either to get rid or get them checked.
I think her slow cooker - an actual crock pot one - is I believe from 1975! So...43 years old!!
Not only is all this pretty amazing generally but this stuff has also survived over 10 house moves too! (Dad was in army)
Ex-mil married late 60's and I'm fairly confident in saying she will similarly still probably have much Tupperware etc that she bought as a new wife too. When I was still going to her home pre-divorce she certainly also still had a magimix thing, also a crock pot slow cooker, an an electric carving knife from around that time so they'd have been over 30 years old even then!
"Had a brilliant little veg knife over 20 yrs old but it got put in bin by accident and i cant find anything nearly as good." Feeling your pain, due to aforementioned OCD and also a small house fire I've lost numerous things that weren't well known brands or anything but were PERFECT for me and for which I have been unable to find replacements it's so annoying! One was also a little veg knife I bought in one of those "sells everything" "not quite a pound shop" places - that was the fire the handle melted! I've also got a really bad habit of melting colanders by having them too near the hob while cooking and not realising until it's too late 🙄
"Heated rollers that must be nearer 40." OMG yes my mum has "carmen rollers" she still uses (not sure how safe) that she got for her 16th birthday making them coming on for 60 years old! Although I know not the original plug/wiring as dads brother (an electrician) changed that for her when the old style sockets went.