20 Y.O.

20 Y.O. refers to an abbreviation of "20 years old". It is commonly used in informal writing, particularly online or in casual conversation, to denote a person's age as twenty years old. The abbreviation is a combination of the numeral "20", the letter "Y" representing "years," and the letter "O" representing "old." This type of abbreviation is frequently seen in dating profiles, online classifieds, and other situations where brevity is desired. While understood in many contexts, its use may be considered unprofessional or inappropriate in formal written communication.