Step 1
Locate the dryer serial number. The serial number is located on a metal plate or sticker physically attached to the dryer. The serial number may be located inside of the door jamb, or on the sides or rear of the dryer.
Step 2
Identify the second character of the dryer's serial number. This letter or number indicates the year in which the dryer was manufactured.
Step 3
Navigate to the Electrical Forensics "Whirlpool Date Codes" website in your Web browser (see Resources).
Step 4
Match the second character of the dryer's serial number to the chart at the top of the page. Dryers manufactured prior to 1990 have a number and dryers manufactured after 1989 have a letter. The year represented by each letter or number is located to the right.
Step 5
Subtract the year of manufacture from the current year to determine the approximate age of the dryer. For example, as of 2011, a dryer with the serial number of MT2513399, which was manufactured in 2006, is five years old.