hundredyearold

Hundredyearold is an adjective used to describe something that is one hundred years old. It is commonly applied to objects, living beings, institutions, or events that have survived for a century. The term can also function as a compound noun to refer to an entity that has reached that age, such as a hundredyearold oak or a hundredyearold monument.

The phrase derives from the English language construction of combining a numeral with a noun to form an adjective, as in "threefold," "fourth," or "twentieth." While most English speakers encounter the more straightforward "hundred-year-old" or "100‑year‑old," the concatenated form "hundredyearold" appears in certain informal contexts and some literary styles. It is less common in formal writing and is generally avoided in style guides that prefer hyphenated forms for compound adjectives before a noun.

Hundredyearold has practical applications in legal and cultural contexts. For example, in heritage conservation, buildings listed as "hundredyearold" often receive special consideration for preservation funding. In biology, a "hundredyearold" animal may be noted in longevity studies. The term also appears in marketing, where a brand might emphasize that its product line has been "hundredyearold," implying tradition and reliability.

While not a part of the standard dictionary in many verbatim forms, the concept is understood universally in English. Its usage reflects the human tendency to honor longevity and the significance of a century’s passage across diverse fields.