Pulsator fraction (top panel) and pulsator occurrence (bottom panel) as a function of cluster age. Colors show the [Fe/H] of each cluster from previous literature (see Table 1). The gray point with the arrow shows the Cep–Her complex, which is made up of stellar populations with ages between 25 and 80 Myr (S. J. Murphy et al. 2024). The gray band in the top panel shows the pulsator fraction measured among field δ Scuti stars (e.g., S. J. Murphy et al. 2019; A. K. Read et al. 2024; P. Mani et al. 2025).