  We have used deep HST WFPC2 observations of two fields in NGC 2420 to produce
a cluster CMD down to V = 27. After imposing morphological selection criteria
we find eight candidate white dwarfs in NGC 2420. Our completeness estimates
indicate that we have found the terminus of the WD cooling sequence. We argue
that the cluster distance modulus is likely to be close to 12.10 with E(B-V) =
0.04. With these parameters we find a white dwarf cooling age for NGC 2420 of
2.0 +- 0.20 (1 sigma) Gyrs. The 0.20 Gyr uncertainty includes errors in the
photometry, sequence fitting, precursor time scales, and theoretical white
dwarf cooling time scales. Comparing the cluster white dwarf cooling age to
ages derived from stellar isochrone fitting we find a preference for ages
derived from models incorporating convective overshoot.
