Determining the age of an eletrical panel

With the new citizens 4-point form they ask for the age of the main panel. I’ve been finding that some homes have upgraded panels but did not pull permits. So my question is how to determine the age of the panel if a can’t find a date code on the panel or a permit number?

In my Non-Floridian opinion… if the panel was replaced without a permit, it was replaced illegally, thus there was no recognized replacement, so it is still original to the home build. Tuff-titties to the offender!


Thanks for the advice.

JJ is correct… No permit no credit.
However, My question to you is…
How do you know that no permit was pulled?