Top panel: rotation sequence for the comoving targets of KELT-20. The target with Kepler photometry is marked with a +. For comparison, we also show the 80 Myr α Per association (purple triangles; A. W. Boyle & L. G. Bouma 2023), 120 Myr Pleiades (yellow pentagons; L. M. Rebull et al. 2016), the 120 Myr Blanco-1 (yellow hexagons; E. Gillen et al. 2020), the 300 Myr Group X (salmon squares; S. Messina et al. 2022), the 300 Myr NGC 3532 (salmon diamonds; D. J. Fritzewski et al. 2021), and the 670 Myr Praesepe cluster (pink inverted triangles; R. Rampalli et al. 2021). The corresponding gyrochrones for each association are also shown (L. G. Bouma et al. 2023). Bottom panel: Our gyro-interp results for the comoving targets are displayed in the rotation sequence. The lower and upper errors are the 16th and 84th percentiles of the resulting probability distribution function. Also shown for comparison are the age of the Theia 427 moving group (teal band) and our isochronal age estimate (pink band), with shaded regions indicating the 1σ uncertainties.