How to Tell the Age of Maytag Appliances Find the serial number. Maytag stamps its appliances with serial numbers in at least one place and sometimes more. Find the year and month code. Each Maytag serial number contains two letters. Determine the year and month of manufacturing. The first number represents the year and the second represents the month. Click to see full answer. Consequently, how can I tell the age of my Maytag washer?If a receipt or other paperwork is not available, the age of a Maytag washer can be found by looking at the serial number. The last two characters of the 10-digit number indicate the year and month of manufacture. A Maytag washer serial number is 10 characters long, with the last two characters being letters.Also, how old is Maytag Atlantis washer? eighteen years old Similarly, it is asked, how can I tell how old my washer is? To determine the age of your appliance, use your serial number (not model number) to find date of manufacture. Our serial numbers begin with two letters followed by six numbers. The 2 letters at the beginning of the serial number tell you the month and year it was made.How do I find the model number of my Maytag washer? Where to Look: On the back, behind the control panel. Inside the washer lid, right bottom corner. On the back on the baseframe to the left.