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Young stellar associations represent a key site for the study of starformation, but to accurately compare observations to models of stellarevolution, the age of an association must be determined. The Upper Scorpiusregion is the youngest section of the Scorpius-Centaurus OB association, whichis the largest collection of nearby, young, low-mass stars. The true age ofUpper Scorpius is not clear, and an observed mass-dependent age gradient inUpper Scorpius, as well as in other star-forming regions, complicates agemeasurements. The age gradient may indicate a genuine astrophysical feature ormay be an artifact of unrecognized systematic effects in stellar agemeasurements. We have conducted a synthetic red-optical low-resolutionspectroscopic survey of a simulated analog to the Upper Scorpius star-formingregion to investigate the effects of unresolved binary stars (which havemass-dependent demographics) on age measurements of a stellar population. Wefind that the observed mass-dependent age gradient in Upper Scorpius can beexplained by a population of undetected binary stars. For a simulatedpopulation with an age of 10 (RMS = 2) Myr, we measure an age of 10.5 (RMS =3.5) Myr for F stars, and 7.5 (RMS = 5.8) Myr for M stars. This discrepancy iscaused by the mass-dependent mass ratio distribution and the variable steepnessof the mass-luminosity relation. Our results support the previously suggested10 Myr age for Upper Scorpius, with a small intrinsic age spread.

Undetected Binary Stars Cause an Observed Mass Dependent Age Gradient in Upper Scorpius