How can you tell age of Remington 222 rifle?

Look at the barrel on the left side, about a half inch forward of the receiver- you should find some very small letters stamped there. You may need a magnifier to accurately read them. They are a code to show month and year made. The Remington Collector's Website has a table of date codes to decipher them. Note that is the date the BARREL was made. If original to rifle, is also date rifle was made.