Numerical passwords (or PINs) are a commonly used "what you know" password mechanism. However, numbers could be difficult to remember, and particularly for emergent users. Graphical passwords, and especially passwords based on human faces, could be an alternative, as we humans remember and recognise other human faces easily. Further, we posit that if these human faces happen to be of well-known personalities (such as celebrities), these should be even easier to remember. In this paper, we present a within-subjects, counterbalanced, longitudinal study with 30 emergent users that systematically compares the performance of PINs with Passfaces of two types, one composed of unknown people (Passfaces for short) and Passfaces based on celebrities (Celebrities for short). Passfaces and celebrities had a larger password space by design (and hence, arguably, were more secure) than PINs. Users were asked to memorise each password and recall the same after subsequent intervals. The analysis of the results showed that PINs and graphic passwords were not significantly different in terms of memorability.