Inherited capital; best when the money has been in the family for at least 3 generations.
The Pews, the Rockefellers, the duPonts, the Fords, the Mellons, and the Vanderbilts all certainly qualify as old money.
Contrary to what many think, the "upper class" is not always the richest of the rich, and they are not necessarily conservative.
For example, Bill Gates, despite being one of the richest men on the planet, does not really fit in with the traditional American upper crust. As far as politics, the Boston Brahmins, who are the epitome of "upper class," were liberal.
"Jackie Onassis was upper class but poor." - Paul Johnson, in his book A History of the American People
A small island off the coast of Connecticut that is falsely believed to be summered at by "old money" families.
Nantucket has been taken over by nouveau riche corporate types with flashy cars and houses.