In ye olde times when battles were fought with honest swords lefties had a distinct advantage because 90% of the opponents were right-handed and trained to fight against other right-handed people, whereas left-handed were also trained mainly to fight right-handed folks, seeing how only 10% of opponents could be of the same preference. Another advantage they had was the fact that they weren't hindered by the tradition of building spiral staircases of fortifications to rise clockwise so that the defender would have an advantage. For a lefty attacker that would only have been an opportunity (though vice versa if he was the defender, but in those cases he could have left it for the others).

Well, anyway, happy Birthday!