I've been cutting my own hair since like 1991 or so with two exceptions: a professional haircut before my wedding and one before my wife's sister's wedding.
Back in 1991, my parents bought me a set of Wahl clippers. Over the years, I broke two of the combs and a few of the extensions. Plus it has a crack down the side of the plastic body. At one point, I was cutting hair for a bunch of people on my dorm floor in college. It's seen a lot of use in 23 years.
However, a month ago, it started shorting the circuit. There's a loose wire or frayed something or something something. Between that and the crack down the side of the plastic body, I figured it's time to retire them and get a new set. The new set arrived today.
23 years is a long time. I have very few things that I've had for a long time. I bought my bicycle in 1992 or so. I have a clock radio I got in the mid-80s. I have a solar powered calculator from 1990 or so (TI-36). Everything else seems to fail within 5 years: blenders, toaster ovens, rice cookers, drills, computers, etc.
I'll miss those clippers. I hope the new ones last as long.