fourteen-year-old

The compound "fourteen-year-old" is a modern English construct following a productive pattern for specifying age. Its first element, "fourteen," originates from the Old English numeral system, combining the words for "four" and "ten." The subsequent elements, "year" and "old," are native English words of Germanic origin, with "year" referring to the solar cycle and "old" denoting duration of existence. The hyphenated structure grammaticalizes these three distinct concepts into a single, fixed adjective or noun phrase that precisely denotes an entity's age of fourteen years, illustrating English's analytical approach to descriptive modification.

Structure: fourteen + year + old fourteen: From Old English 'fēowertīene', a compound of 'fēower' (four) and 'tīene' (ten). It functions as the cardinal number. year: From Old English 'ġēar', meaning a period of twelve months. It functions as a noun specifying the unit of time. old: From Old English 'eald', meaning having lived for a long time. It functions as an adjective describing age.