Frequency of stars hosting JL planets (corrected for completeness) in individual associations as a function of association mass. Upper panel: masses as obtained by summing the mass of the member stars. Bottom panel: masses corrected for the selection along the galactic Y coordinate. Blue dots are associations with an age <50 Myr; orange squares are associations with a total mass >50 Myr. The open triangle represents the frequency of stars hosting JL planets from the RV surveys. We arbitrarily assumed a mass of 1000 M_⊙ for the typical birthplace of stars in these surveys.