Rueda can age

When I decided to visit Rueda I was offered the opportunity to taste old Verdejo vintages, some bottles being up to 20 years old! There were wines made in stainless-steel tanks and with lees work that were apparently not destined for long ageing in bottle. Surprisingly, the tasting showed that they can in fact mature for 10 or more years with obvious tertiary notes (caramel, toasted nuts, dried fruit) without showing any evident trace of volatile...