[[WMG: Flynn Carson is [[IndianaJones Henry Jones III]] or his half brother.]]
He and Marion may be living under an assumed name after that debacle with the Russians ("[[ErrolFlynn Fancies himself a swordsman]]"). The Ark of the Covenant was moved from Area 51 to The Library after the incident in [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull Crystal Skull]], and he never mentioned ''where'' he saw the holy grail (it was made of wood in this continuity, as well as in ''[[Film/TheLast ŚCrusade]]''), which may explain why he doesn't look 50 (that or he's a different son, and the father who told him stories was a stepfather, which accounts for the navy flashback much better than "costume party" or "metaphor").