"That would make this Jim Smith 59 or 60 at the time of the email, if the 1945 refers to a birth year as so often
happens."
Unless someone is being purposefully deceptive with their email address.
Executive Jim Smith was born on Feb 8, 1942. Could be a red herring where O'Duh'erty created yet another fake email address to mislead investigators.
Or just a coincidence.