28y

28y is a compact notation that pairs the numeral 28 with the letter y, a common abbreviation for year. It is used to indicate either an age of 28 years or a time span of 28 years, depending on context. The shorthand is informal and not a formal unit; many style guides prefer writing out “28 years” or “28-year-old” in prose, while data tables or exports may use compact forms like “28y.”

Common uses include demographic labeling, where an individual might be described as 28y old, and in datasets where age is stored as a shorthand value. In longitudinal or historical records, 28y can denote a duration of 28 years since a starting event. The notation also appears in genealogical notes and other contexts where space or brevity is prioritized.

Ambiguity can arise because 28y is not standardized across disciplines. Readers should rely on surrounding text or accompanying metadata to disambiguate whether it refers to age or a time interval. Variants such as 28y/o, 28-year-old, or 28 yr/yrs are common alternatives, and usage may vary by language or publication style.

See also: year, age, shorthand notation. In summary, 28y is a flexible shorthand primarily used for concise representation of age or duration, with meaning determined by context.