4th D is aged for a minimum of nine months before being released. This ale has an intense sweet caramel malt flavor and aroma that develops into a toffee / toasted marsh mallow like character. (from 2013 label) 2018 vintage. 2-year Barrel aged Fourth D (from https://kbrewery.com/product/ba-4d-olde-ale-fourth-dementia-4-pack-12-oz-bottles/) This batch of 4th D is aged for over a year. (from 2022 label) 2004: 11.2%