Years wow us Brits reckon to replace every 2 - 3 years if you 2 or more kids. Having said that my Hotpoint is still going and that is about 1992.
My old Whirlpool set lasted 12 years and 5 moves. The washer entered its death throes when Anoreth left a screwdriver in her pants pocket and it locked the basket when it was trying to spin. Burned out the belts (not an expensive repair) but also damaged the seals so it leaked.