What's the longest anybody has actually used a Fatboy or a Slim here? For example, used for 3 years, sat in a closet for 40 years, take out and used for 2 years would be total 5 years use. I realize that most folks got their Fat/Slim used, so just count the years you've had the razor and amount of use the razor got in your rotation.
While they are built like tanks, are they built to be in service 10, 20, 30 40 years? They are simple machines after all and machines do wear out.