Uncle Martin describes a Martian year as being made up of 300 weeks, with each week being made up 8,672 days which would be 7,127 Earth years. Actually, a Martian year 668.59 Martian days (sols) or 687 Earth days. Thus, a Martian year is 1.88 Earth years long which would make Martin approximately 846 Earth years old.
The expert authenticator's name is Donati (Italian), yet the man randomly utters a couple of French words ("Mon Dieu!" / "My God!").