Orphan Barrel Rhetoric 25 Year Old BourbonRhetoric 25 Year Bourbon marks the sixth and final release in the Orphan Barrel series. The Rhetoric series consists of progressively aged bourbons discovered in old distilleries and cellars. The first Rhetoric bottling released was a 20 year old bourbon. The mash bill is the same in the series (86% corn, 8% rye, 6% barley) with the proof increasing slightly each year.