I had acquired a couple of Samuel Adams "one-off" beers, specifically "The Vixen (stout)", "Merry Mischief (gingerbread stout)", "Griffin's Bow (barley wine)" and "Norse Legend (Sahti)". These bottles are either first, second or third batch, according to the label mind you. I had these beers for 2 years in a cellar, almost no light touches them and at room temperature.
I know that most of this types of beer gets better with time, except for the Sahti, hadn't explored much of that type, but I would like to know if it's safe for the beers to be kept and for how long, and at a given time, what's the best way to drink them (chill them, room temperature, etc.). Thanks.