The impressionable years thesis asserts that early adulthood is accompanied by increased attitudinal vulnerability. Although there is tentative empirical evidence to support this idea, it remains unclear whether this sensitivity is due to exposure to change-inducing circumstances, typically encountered in early adulthood, or due to the weight attached by young people to new information. I address this question, focusing on a political event—the Watergate—that offers a test of youth’s heightened susceptibility, holding exposure constant. The results confirm the impressionable years thesis and shed light on how it is most likely to be manifested empirically.