Your serial number can be found on the bottom bracket, the back of the seat tube or on the rear dropouts.

How do you tell what year my bike is?

6 Ways to Find the Age of Your Bicycle
Check the Serial Number. The obvious starting point to find the date a bike was made is the serial number. Use Online and Offline Literature. Look at Specific Parts. Ask the Seller or Owner. Bring It to a Bike Shop. Post Online.