Sherry wines go through a Solera aging system. A Solera system is essentially a series of barrels that are linked, usually stacked in a pyramid form. Wine is removed from the bottom barrels, and new wine is replaced in the top, with the wine therefore being a blend of years. In this case, the oldest wine is from 1927! That’s right! 1927!!! Saying that, Alvear also make an 1830 dated Sherry.