Distribution of the logarithm of the rotational velocity of the stars from the three populations, old (in blue), young (in green), and very young (in red). The inset shows the normalized cumulative fraction. The Kolmogorov-Smirnov test indicates that the distribution of rotational velocity of the old and younger populations is not extracted from the same parental distribution with more than 5σ significance. The same applies when the non-deconvolved rotation velocities are used.