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When a number with a fraction is used as a quantifier, it is not hyphenated (e.g., two and half years). If the number is used as a compound adjective or noun, then hyphens should be used (e.g., two-and-a-half-year journey).
24 Οκτ 2022 · In English grammar, we use hyphens when a noun and a number are used together as an adjective to describe another noun; such constructions are known as compound adjectives with numbers. For example, the phrases hundred-story building, 21-year-old actor, and one-hour drive are all compound adjectives with numbers, and they all use hyphens.
I'm trying to write "3 and a half year old," as in, "He is a 3 and a half year old dog". I know a hyphen or two is supposed to go in there somewhere. Per Ways to write "2000 year old", I suspect it should be "3-and-a-half-year-old", but that reads like death-by-hyphen, even if it is correct.
“Year and a half” and “year-and-a-half” are both correct. You should keep it unhyphenated when it is part of its own phrase and modifies no nouns (i.e. “it took a year and a half”). You should hyphenate it when it is a compound adjective modifying a noun (i.e. “year-and-a-half trip”).
27 Ιουλ 2010 · Her daughter is two and a half years old. OR She has a two-and-a-half-year-old daughter.
Spelled-out numbers or numerals with units of time that don’t appear directly before a noun—in other words, those that aren’t acting as compound adjectives—don’t need to be hyphenated. However, double-digit numbers (e.g., forty-one, ninety-nine) should maintain their normal internal hyphenation.
7 Απρ 2015 · Typically, we say two and a half years. But if someone asks you how old a child is, "years" is usually omitted: "He's two and a half." It's not really a question of grammaticality; one way is just much more common than the others.
