Frequency of stars hosting JL planets (corrected for completeness) in individual associations as a function of association mass. Blue dots are associations with an age <50 Myr (Gratton et al. 2024); orange squares are associations with a total mass >50 Myr (Gratton et al. 2024); red circles are the open clusters discussed in this paper. We corrected the observed frequency in Hyades for the higher than solar metallicity of the cluster. The grey triangle represents the frequency of stars hosting JL planets from the RV surveys (adapted from Fernandes et al. 2019, see Appendix A). We arbitrarily assumed a mass of 1000 M_⊙ for the typical birthplace of stars in these surveys.