Depends on what factory made it, whether it has import marks, condition, history, accessories, papers, etc..
The lower the serial number the younger the pistol is
The PY in the middle of your serial number dates your pistol to 1982.
Exactly how is the pistol marked? 9mm browning serial number 72C44338
In order to tell how old your Colt 25 semi auto pistol is, you will need to offer the serial number. This number gives you an idea of when the pistol was manufactured.
No way to answer without the serial number.
No serial number = no answer.
Frame
Impossible to tell from just the sn. if you found the serial number, you will be able to find the caliber of the pistol somewhere carved in the metal.
Serial number data not available
Impossible to answer without the serial number.
No serial number provided.
You can find the model and serial number by going to proofhouse.com.