Evolution in time of the dispersion in the η′ coordinate for a simulated YLA using a resampling technique where we only consider (from top to bottom) 5, 15, 25, and 100 members of the 500 members of the association. The initial conditions are IC-1 with orbit-1 and ages (from left to right) of 20,50, and 80 Myr (marked with a vertical black dashed line). The different lines are the intrinsic dispersion (σ_int, cyan dot-dashed line) and the estimated intrinsic dispersion of each of the 100 trials (σ_res,est, green solid lines). In each panel, we indicate the percentage of success in determining the dynamical age.