I think my oldest disk may probably be either a decade or close to a decade old.
It is a WD 1 TB HDD with 24798 h of usage (2.83 years=2 years 9 months, 28 days aprox).
I used to store frequently used programs and files there, as well as downloads, so I had it on most of the time.
Out of fear of it breaking, at the beginning of this year I moved all that content to a newer disk and now I use this one to run Stable diffusion. It has not broken yet despite using it daily.