Don't Spend Money Recklessly
The difference between old money and new money, of course, is the fact that old money has lasted for generations. And to stretch out that wealth, the old money set is famously frugal. If you don't want to seem like you just came into your fortune, don't spend money recklessly or simply to show off.
Flashy cars, private jets, magnums of champagne? Are you the Tinder Swindler?