The Friday File: While 13% of Americans consider themselves superstitious, among those 18-25, 18% are and 15% of those 30-44 are. Among those 45-64, it’s 11%, and for those over 64, it’s 6%. Interestingly, 35% consider picking up a penny good luck, 30% consider knocking on wood good luck, and 27% consider finger crossing and the larger part of the wishbone good luck. 18% consider Friday the 13^th bad luck.