Definitions for old money
Random House Webster's College Dictionary
Origin of old money:
silver spoon, old money(noun)
the inherited wealth of established upper-class families
"he was born with a silver spoon in his mouth"; "she is the daughter of old money from Massachusetts"
Families that have been wealthy for generations or members of such families.
The monetary system used in the United Kingdom before decimalisation (1971) and consisting of pounds, shillings, pence and farthings.
The imperial system of measurement, as opposed to the metric system.