Old White Man
A politician or other wealthy person with influence. Called such because the vast majority of politicians and powerful people in the USA are old, white men.
In what some political observers are calling his most ironic speech of the 2008 campaign, GOP presidential nominee John McCain today lashed out at Washington, the Republican Party that he called an "old white man with white hair."
38 year old white man
Usually referring a person on Reddit who thinks they're better than everyone else.
Twitter is filled with 14 year old white girls, meanwhile Reddit is filled with 38 year old white man (men).