Which of the following is NOT a typical element of a firearm trace?

A typical firearm trace involves several specific elements that help to identify the history and ownership of a firearm. The serial number is a crucial identifier that is unique to each firearm, allowing law enforcement to link a weapon to its manufacturer and, often, its original owner. The manufacturing year provides insight into when the firearm was made, which can help in establishing its history and any potential for a trace through sales records or prior incidents.

Caliber or gauge is significant because it specifies the size and type of ammunition the firearm uses, which can be critical in forensic investigations and linking a firearm to crime scene evidence.

Owner's age, however, does not play a direct role in the tracing of a firearm. While knowing the age of a firearm owner could provide context or help with investigations, it does not serve as an identifying factor of the firearm itself. Therefore, this aspect is not part of the standard elements in a firearm trace.