15 years of photography 
Having recently made a list of computers I've owned over the last 20 years, I decided to make a list of photography equipment I've owned. This list goes back to the first film camera I can recall buying for myself, around 1997. In that time, I've bought 7 cameras and 11 major accessories. Of those, I still own and use one of those cameras and six of those accessories.
20 years of computers 
During some downtime, I made a list of all the computers I could remember owning. The list is surprisingly long, and goes back to 1992 (before which I had a Commodore 64 but that barely counts, does it?) I came up with 10 desktops and 7 laptops, or a new machine nearly every year. The last 5 years have only seen 3 new machines, though, so the pace at which I buy computers may be slowing.