I heard the opposite that anything coming out of a barrel should be drunk soon, still I like it a little aged. I still have a 4 pack from 2 yrs ago, will do a comp between the 3 yrs when I get the 2017.
Aging a high %ABV beer (9 or above) is always preferable, as they're pretty boozy when young, that sharp alcohol bite mellows out with a little time, the other flavors mature. KBS definitely tastes batter after about 10mo on it. Also let them warm up a little before you sip, that way you get the complexity from the malt, vanilla, and smoke.