Jack Daniel's 10 and 12 Year Old Tennessee Whiskey: Jack Daniel's 10 and 12 Year Old Tennessee Whiskey, aged 10 and 12 years. Maturing whiskey for more than 150 years gives us the knowledge necessary to slowly rest our Tennessee whiskey through 10 and 12 summers with the taste of warm butterscotch and soft fruit. We think you'll agree, it's worth the wait.