Mass-radius diagram for low-mass stars in eclipsing binaries with intermediate ages compared to Dartmouth standard (gray) and magnetic (black) models. The circles are for the EBs in Sco-Cen: components of MML 53 (Gómez Maqueo Chew et al. 2019) and 2M1222–7 (Stassun et al. 2022) are shown in red, and MML 48 (this work) is given in blue. The red squares with error bars are for each component of NP Per (Lacy et al. 2016). The standard models show the first fusion bump at 17 Myr, but at a larger mass than the MML 48 primary. The Dartmouth magnetic models can best reproduce the ensemble of EBs, including the large radius of the MML 48 primary, but they require an age of 20−22 Myr depending on the solar composition.