Comparison of the UVW space motions with respect to the Sun for the TYC 4144 329 system (crosses) with the UVW of stars with known ages. We plot the entire range of plausible distances for the TYC 4144 329 system as determined by ranging the luminosity of TYC 4144 329 1 from that of a main-sequence dwarf to that of a class III giant. Triangles in the plot are white dwarfs with a mean cooling age of 1.86 Gyr (where the cooling age does not include the main-sequence lifetime of ~1–3 Gyr for the typical white dwarf in this sample; Zuckerman et al. 2003; Bergeron et al. 2001). The rectangles represent the "good" UVW box for young stars as defined in Zuckerman & Song (2004). As stars age, the Galactic potential acts to disperse them away from the young star boxes.