Around 1974, so some 40 years ago, whilst on site at Laporte Industries titanium dioxide plant at Immingham, I acquired some steel toecapped safety wellingtons. I still have them and they are in regular use.
What is your oldest item still in regular use? No, not that part of your body!
( I have decided not to mention the yard brush, still as new, passed down from my great grandfather that has lasted for over 130 years, with only six new handles and seven brush heads in all that time)