Yeah!
I've just recently heard the same thing! If you're going to fly somwhere where you either have to use your FAA ticket or are being issued a validation based on it, then the age limit of the country (in this case USA) that issued the basic licence applies.
Of course there is always more then one way to skin a cat. For instance, you could research what country might have an easy way to convert your FAA ATP and type rating/s to their licence and allow you to fly beyond 60.
Also, I suspect if someone really needs your talents, they may suggest a way in which this can be accomplished.
Good luck!