  We report a dynamical measurement of the mass of the brown dwarf GJ 802B
using aperture-masking interferometry and astrometry. In addition, we report
the discovery that GJ 802A is itself a close spectroscopic non-eclipsing binary
with a 19 hour period. We find the mass of GJ 802B to be
$0.063\pm0.005$M$_\sun$. GJ 802 has kinematics inconsistent with a young star
and more consistent with the thick disk population, implying a system age of
$\sim$10 GYr. However, model evolutionary tracks for GJ 802B predict system
ages of $\sim$2 GYr, suggesting that brown dwarf evolutionary models may be
underestimating luminosity for old brown dwarfs.
