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five and a half years No hyphens. Hyphens are for adjective phrases: It was a five-and-a-half-year journey. You also don't use the hyphen with the fraction. 51⁄2 years
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/7445 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7445 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/