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We present BV photometry of the Galactic globular cluster NGC 5286, based on128 V frames and 133 B frames, and covering the entire face of the cluster. Ourphotometry reaches almost two magnitudes below the turn-off level, and isaccordingly suitable for an age analysis. Field stars were removedstatistically from the cluster's color-magnitude diagram (CMD), and adifferential reddening correction applied, thus allowing a precise ridgeline tobe calculated.  Using the latter, a metallicity of [Fe/H] = -1.70 +/- 0.10 in the Zinn & Westscale, and [Fe/H] = -1.47 +/- 0.02 in the Carretta & Gratton scale, was derivedon the basis of several parameters measured from the red giant branch, in goodagreement with the value provided in the Harris catalog.  Comparing the NGC 5286 CMD with the latest photometry for M3 by P. B. Stetson(2008, priv. comm.), and using VandenBerg isochrones for a suitable chemicalcomposition, we find evidence that NGC 5286 is around 1.7 +/- 0.9 Gyr olderthan M3. This goes in the right sense to help account for the blue horizontalbranch of NGC 5286, for which we provide a measurement of several morphologicalindicators. If NGC 5286 is a bona fide member of the Canis Major dwarfspheroidal galaxy, as previously suggested, our results imply that the latter'soldest components may be at least as old as the oldest Milky Way globularclusters.

The Globular Cluster NGC 5286. I. A New CCD BV Color-Magnitude Diagram