Geriatrix (French: Agecanonix) is the oldest inhabitant of Asterix's village: he is said to be 93 years old in Asterix at the Olympic Games (which would place his birth around 143 BC). While drunk, he says he feels ten years younger: to which Asterix replies, "Well, that makes you 83, and it's time you were in bed"). Some translations make him no more than 80 – and as such he demands respect (generally more than he is given). Nonetheless he dislikes being treated as old and will attack anyone who comments to that effect. In particular he often beats up Fulliautomatix for refusing to fight back due to his age, and actually cries out to be attacked. Geriatrix is seen to sit on the village council at times, on the face of it an entitlement deriving from being the oldest in the community. An example is on p.11 of Asterix and the Cauldron where he sits with Vitalstatistix, Cacofonix and Getafix, in deciding upon Asterix's punishment for having violated their honor code. In Asterix and the Roman Agent he acquires a club which he later uses to knock down The Mansions of the Gods.
Geriatrix is against foreigners who are not from his village. He is a veteran of the Battle of Gergovia and the Battle of Alesia, and refers to them when excited ("It'll be just like Gergovia all over!") or distraught ("It's just like Alesia all over again!"). He has an eye for the young ladies and has a very young and beautiful wife (who appears to be in her twenties) of whom he is very possessive — particularly when Obelix is around. His wife has never been given a name either in the French original or in the English translations.
In prequels such as How Obelix Fell into the Magic Potion When he was a Little Boy, in which most of the characters are children and Vitalstatistix is a slim young man, Geriatrix, along with Getafix, is unchanged.