I almost never drink, anymore, mostly related to some athletic goals; but, the other evening I did pull a January 2016 Dogfish Head Immort Ale out of the cellar.
I remember it getting little better than a shrug from me, back when fresh. Nothing to write home about.
But oh boy has the last decade been kind to it. It had turned into a viscous, rich elixir foregrounding dark-fruit esters on a carmelized backbone.
Almost across the board these bigger beers need at least a few years in the dark to come into their own.