Then there's amateur radio.
Old man (or OM) == a male amateur radio operator, regardless of actual age.
Young lady (or YL) == an unmarried female amateur radio operator, regardless of actual age.
Ex-young lady (or XYL) == a married woman (whether she's an amateur radio operator or not), often in the context of a male amateur radio operator's wife. (As in, "A1BC, how's your XYL?")
(Also note that even in in-person speech, amateur radio operators will use the abbreviations. And, XYL will be used even in morse code, even though -..- -.-- .-.. (XYL) is longer than .-- .. ..-. . (WIFE) to transmit.)