From the brewery:

GUEUZE TILQUIN À L'ANCIENNE – CUVÉE ARTHUR (2022-2023) is blended in honor of Arthur Tilquin (1865 - 1932), great-grandfather of Pierre, with 20% 1-year old lambics, 30% 2-year old lambics and 50% 3-year old lambics, all matured in oak barrels. Unfiltered and unpasteurized, this beer is refermented and matured in the bottle for minimum 1 year.
It is part of our Family Tree Project: a different blend for each member of the Tilquin family tree.