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It's Asterix's and Obelix's birthday. Friends they've made from all over come to the village to discuss what would make a good gift for the heroes.

Our story begins with Albert Uderzo giving readers a glimpse at the future of Asterix's village. In the year AD 1, the fortifications protecting the village have fallen into disrepair, Roman estates have been built near the four main camps, and the main cast have become old men. While his son and wife go shopping at Compendium, Asterix takes his grandchildren to see Obelix, who is not happy that with the forests torn down to make room for the Romans, there are no wild boars to eat. Getafix, now with an even longer beard, comes along accompanied by Uderzo himself, who takes credit for the current affairs. Outraged, Obelix lays out one of his creators with an uppercut, and, his lesson learned and teeth missing, Uderzo restores the timeline to the year 50 BC. Asterix and Obelix go out for a hunt, writing off the previous events as a dream.

Meanwhile, the village is visited by large numbers. They are here to celebrate the birthdays of Asterix and Obelix, and a discussion is held as to what kind of present our heroes deserve. Mrs. Geriatrix suggests a wardrobe upgrade, and presents a look at Obelix in different styles of clothing. As for Asterix, he may look suitable done up like a Marsupilami.

Postaldistrix the messenger reveals that he has parcels for Asterix and Obelix, and even delivered a carving for Obelix the previous day. Upon realizing that it was from Panacea, but unable to read it himself having never learned how, Obelix went to see Getafix for help, without admitting why. Getafix provided the larger Gaul with a picture book to help learn the alphabet, but naturally, Obelix became confused when he read each letter to mean a different thing. Asterix, deciding to help, read the message as, "Dear Obelix, Happy Birthday -- Panacea." leaving Obelix to throw the picture book back at Getafix in frustration.

Postaldistrix presents other birthday greetings, such as a message from Edifis the Egyptian from ''Asterix and Cleopatra'', and even a greeting from the pirates. Ekonomicrisis the Pheonician suggests that since Asterix and Obelix are always traveling, they might find a guidebook useful. Cacophonix wants to give the pair autographed slabs of his songs.

Meanwhile, Impedimenta brings the ladies of the village (including Panacea, Influenza from ''Asterix and Caesar's Gift'' and Bravura from ''Asterix and the Secret Weapon'') inside for a talk on Asterix and Obelix's marital status -- or lack thereof. Talk turns to how a wife could change them, and why they haven't found a decent girl. Influenza feels that Asterix may someday get married, Impedimeta feels sorry for any future brides, who would have to put up with Asterix's travels and Obelix's appetite.

Squareonthehypotenus wants to build a theme park in Asterix and Obelix's honor, proposing many different attractions. Laurensolivius from ''Asterix and the Cauldron'' feels a major theatre production would do better. Prolix, however, predicts that works of art based on them will be made, enough to fill a museum.

Meanwhile, in Amorica's coast, Cleopatra demands that Julius Caesar, as thanks for the Gauls for saving their son Caesarion from Brutus, present his own gift to them. Caesar calls for his pharmacist to concoct a special wine with a little secret surprise, figuring he can get revenge on the Gauls for constantly humiliating him and appease Cleopatra's demands at the same time. He has the unwitting centurions of the four surrounding camps deliver the wine. Getafix, suspecting a trick, invites the Romans to each have a toast of the wine. They do, and are forced to flee -- it contained ricin oil, a powerful laxative.

Asterix and Obelix return from their boar hunt. Obelix apologizes for hurting Getafix earlier, and the forgiving druid sends the two heroes into the village to receive their ''[[https://happybirthdayall.com/birthday-wishes-for-friends.html birthday greetings from the various friends]]'', Romans, and countrymen they have met over the course of their adventures.
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!!Tropes
* BackForTheFinale: Practically everyone who has appeared throughout the series, even a few bit characters, turns up for the party.
* TheCameo: The pirates show up at the museum where they naturally have a MassOhCrap at seeing the Gauls.
* ComicBookTime: Lampshaded by Uderzo at the start, where he shows what the characters would look like if they had aged in real-time for 50 years.
* ContinuityPorn: Big time. Whether it be references to past stories or characters, there’s references galore.
* CreatorCameo: Albert Uderzo himself shows up.
* EasilyForgiven: Squareonthehypotenus is the main antagonist in ''The Mansions of the Gods'' and gets quite a few bruises for it, but he and the Gauls have clearly buried the hatchet since then, as he's one of the guests here, and plans a theme park in their honour.
* GoKartingWithBowser: Besides friends, certain enemies show up for the party, including Redbeard, Prolix, Squareonthehypotenus, and Caesar himself. With Caesar, there's the justification that Cleopatra is forcing him because Asterix and Obelix saved their son from Brutus in ''Asterix and Son''. Many more show up in the final spread, including some of the truly evil ones like Convolulus.
* MassOhCrap: The pirates when they see the Gauls in the Museum with the Pirate Lookout saying "'''THE GAU...THEGAUGAU...THEGAULS!!'''"
* MilestoneCelebration:[[invoked]] This album was published for the series' 50th anniversary (1959-2009).
* RageAgainstTheAuthor: When Uderzo shows up to take credit for the TimeSkip, Obelix lays him out, and Uderzo agrees to return the village to normal.
* ShoutOut: To the point of ad nauseum.
** Cacofonix's gifts for the birthday boys are direct parodies of works by Creator/AndrewLloydWebber and Music/MichaelJackson.
** The pirates give a ship as a present, with the lookout calling them [[Film/{{Titanic|1997}} "Kings of the World"]].
* TheScreamParody: One painting in the museum shows the Pirate Lookout doing this with the portrait being called "After Munch".
* TamperingWithFoodAndDrink: As a bit of vengeance for the past defeats they've shown him, Julius Caesar has an amphora of wine mixed with some ricin oil mixed in made up to give to Asterix and Obelix. Getafix stops this by tricking the unwitting Roman Centurions delivering it into trying it instead.
* TimeSkip: Uderzo starts the album by showing what would our heroes be like if they really aged for 50 years. The results are...not pretty.
** BadFuture: It's implied that after the time skip the Romans have ''won''. At the very least, the village's palisade is quite run down, and Petibonum has been turned into a village and the commerce center of the area, where even Asterix goes trading.
** BabiesEverAfter: Asterix has a grown-and-married son and a swarm of grandchildren. Most of the other villagers have offspring of as well.
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