How old is your colt agent revolver serial m93258?

To determine the age of your Colt Agent revolver with serial number M93258, you would need to reference Colt's manufacturing records or a Colt firearm database. Generally, Colt revolvers produced in the "M" series were made in the late 1970s to early 1980s. For a more precise date, consulting a Colt historian or a gunsmith with expertise in Colt firearms would be beneficial.