Histograms of galactocentric distance (R_GC) binned by age. Top and middle panels: radius of stars in the Galaxy binned by age. The age range decreases from top to bottom and left to right. Dashed black lines represent the Gaussian mixture model fitted to the distribution. Individual components are presented as bold black lines. Bottom: full histogram of galactocentric distances for the full sample (black) and the O-rich Miras with periods under 400 days (blue).