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Two eclipsing binaries in the USco association have recently yielded precisevalues of masses and radii for 4 low-mass members of the association. Standardevolution models would require these dM4.5 - dM5 stars to have ages which areyounger than the ages of more massive stars in the association by factors whichappear (in extreme cases) to be as large as ~3. Are the stars in theassociation therefore non-coeval? We suggest that the answer is No: byincorporating the effects of magnetic inhibition of convective onset, we showthat the stars in USco can be restored to coevality provided that the 4low-mass member stars have vertical surface fields in the range 200 - 700 G.Fields of such magnitude have already been measured on the surface of certainsolar-type stars in other young clusters.

Apparent Non-Coevality among the Stars in Upper Scorpio: Resolving the Problem using a Model of Magnetic Inhibition of Convection