eight-year-old
UK: ˌeɪt ˈjɪər əʊld | US: ˌeɪt ˈjɪr oʊld
adj. describing someone or something that is eight years in age
n. a person or animal that is eight years old
The term "eight-year-old" is a straightforward compound adjective/noun formed by combining the numeral "eight," the time unit "year," and the adjective "old." This structure follows a common English pattern for age descriptions (e.g., "five-year-old," "ten-year-old"). The hyphenation ensures clarity, treating the phrase as a single modifier or noun. The logic is transparent: it literally means "having eight years of age."
The eight-year-old boy won the chess tournament.
She adopted an eight-year-old dog from the shelter.
This book is perfect for eight-year-olds.
The museum offers free admission for eight-year-old children.
His eight-year-old car still runs smoothly.