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We present the discovery of a 360 AU separation T3 companion to the tight(3.1 AU) M4.5+M6.5 binary 2MASS J02132062+3648506. This companion wasidentified using Pan-STARRS1 data and, despite its relative proximity to theSun (22.2$_{-4.0}^{+6.4}$ pc; Pan-STARRS1 parallax) and brightness ($J$=15.3),appears to have been missed by previous studies due to its position near adiffraction spike in 2MASS. The close M~dwarf binary has active X-ray andH$\alpha$ emission and shows evidence for UV flares. The binary's weak {\itGALEX} UV emission and strong Na I 8200\AA Na absorption leads us to an agerange of $\sim$1-10Gyr. Applying this age range to evolutionary models impliesthe wide companion has a mass of 0.063$\pm$0.009\,$M_{\odot}$. 2MASS J0213+3648C provides a relatively old benchmark close to the L/T transition and acts as akey, older comparison to the much younger early-T companions HN~Peg~B andGU~Psc~b.

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary