We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems ( Gliese 417 = BD+36 ^ { \circ } 2162 and Gliese 584AB = \eta CrB AB ) have a widely separated , L dwarf , substellar companion .
Using age estimates of the G dwarf primaries , we estimate masses for these L dwarfs from theoretical evolutionary tracks .
For the L4.5 dwarf Gl 417B we estimate an age of 0.08-0.3 Gyr and a mass of 0.035 \pm 0.015 M _ { \odot } .
For the L8 dwarf Gl 584C we estimate an age of 1.0-2.5 Gyr and a mass of 0.060 \pm 0.015 M _ { \odot } .
This latter object also shows evidence of spectrum variability , which may be due to surface inhomogeneities rotating into and out of view .
These new companions are also compared to six other L dwarf and T dwarf companions previously recognized .
For the L dwarf companions , ages implied by the presence or absence of lithium are consistent with ages inferred from the primaries alone .