How do you find the age of a Honda cr 125 when you have the engine number?

did you try looking at the front of the frame and seeing if the age is on the metal vin plate under your stearing head? other wise take the VIN to a dealer and they should figure it out. also upside down forks 88 and older, inverted 89 and newer. steel frame 96 and older, aluminum frame 97 and newer. that could atleast get you a base time period. also not if its liquid or air cooled.