In search of something to drink to mark a milestone birthday, those of us with a less-than-legendary birth year are resigned to the fact that our first breath did not coincide with the perfect growing season in Bordeaux. Revealing your date of birth to châteaux owners keen to open a special bottle often leads to a pitying shrug of the shoulders and a gallic ‘Bof’ when you disclose your parents poorly timed your entry to the world. But there’s hope for us yet: an underground cellar in a small Loire Valley town could be the answer to that elusive anniversary bottle that doesn’t require you to remortgage your house simply to mark a special date in the diary.