Comparison of the values of four different youth indicators for the three systems analysed in this work (GJ 1284, GJ 898, GJ 897) against young objects from the literature. Panel a: Pseudo-equivalent width of the Hα line against members of the Pleiades, Praesepe, and Hyades open clusters from Fang et al. (2018). Panel b: X-ray luminosity of the individual components compared with members from four different open clusters from Núñez & Agüeros (2016) presented in a box-plot. Panel c: rotational period derived from the TESS light curves alongside a compilation of members of the Pleiades from Rebull et al. (2016) and of the Hyades from Douglas et al. (2016), and rotational periods for LA members in Montes et al. (2001) derived in this work (see Sect. 5.1). Panel d: upper limits of the EW of the Li 6708 Å feature plotted alongside the upper envelopes of the IC 2602 and Hyades open clusters, as well as the upper and lower envelopes of the Pleiades (Gutiérrez Albarrán et al. 2020, and references therein)