This question comes up either directly or indirectly in almost every residential inspection. Here is an article from House Beautiful that helps to answer that question. As an InterNACHI certified inspector, we are trained to inspect appliances and give an over view of condition. Age does not always reflect functionality, but it is nice to have an idea what to expect.
https://www.housebeautiful.com/lifestyle/g25319945/how-long-household-appliances-last/
#housebeautiful #Appliances