Knocking on for 40 years old now and this still comes out to show exceptional quality and value. The fruit develops into prunes and figs with a touch of porcini mushrooms. Caves Sao Joao is a family business, founded in 1920 and was originally dedicated to the marketing of fine Douro wines and liqueurs. It is today, the oldest family-run wine company still operating in the municipality of Anadia.