? your Caspar FRITZ with age error ?

1860 Census, Precinct III, Grape Creek Post Office, Gillespie County, Texas
in household of John & Catherine Blank (FIRTZ on Heritage Quest Index)

FRITZ Caspar, 18, servant, born Nassau
FRITZ Amalia, 15, servant, born Nassau (wife or sister or other?)

I'm not related to this family but came across this information when pursuing leads for a LEYENDECKER relative's widow who next married a STAUDT.