Agebend AU

Agebend AU (also known as Age Swap AU) is an Alternate Universe in which the characters of the Big Four have become age-swapped versions of themselves.

About the AU
The AU first started when somebody thought to age swap the Big Four and other extra characters in fandom, or make them older or younger versions of themselves for pairings and their roles in other AUs. Much like how fans swap their gender, race or "specie" so they could fit in the roles that they give them a bit better.

The four are even featured as nine/twelve year old children for when they are portrayed as Sugar Rush Racers for the Arcade AU, along with swapping Merida's age and with Penny's due to a magic wand that fans place in the Pennida pairing. Hiccup is also an example of this AU, as there are one group of fans that like to use teen Hiccup in the fandom while an other group prefer to focus on adult Hiccup.

Hiccup Horrendous Haddock III
Some fans focus on Hiccup's fifth-teen year old self from the first How to Train Your Dragon film, while there are those that prefer to use Hiccup's twenty year old self from the second film or his twenty one year old self from the third film, in the fandom. There are those that like to focus on the Dragon Rider's eighteen-nineteen year old self from the Race to the Edge series, the same with his fellow dragon rider friends. In the end of the third film, Hiccup appears in be in his thirty's.

Jack Frost
Jack can have his (fourteen old year) age switched with his sister's, as she becomes the older sibling while Jack is turned into the little sibling; or make him an adult like the other four members of the Guardians of Childhood. Fans have even featured Jack as a baby that is raised by the Guardians.

In some fanvideos Jamie is used as Jack's child self, while his human form and self is used as his teen or young adult self.

Merida DunBroch
For the Pennida pairing, Merida commonly has her age switched with Penny's due to a magic wand that they both held and is commonly part of the ship. Merida could also have her age switched with her brothers, to make them the older siblings while she is turned into the little sibling.

Hiro Hamada
Hiro's age is mainly swapped with Tadashi's, as he becomes the older Hamada sibling. He is even featured as a younger child for the Vaniro pairing.

Tadashi Hamada
Tadashi's age is mainly swapped with Hiro's, as he becomes the younger Hamada sibling.

Vanellope von Schweetz
Vanellope's age is mainly swapped with Ralph's, as she becomes the oldest of the two. She is even featured as a teenager for the Vaniro pairing, along with some other pairings and AUs in the fandom. When Vanellope joined Slaughter Race, fan begin to theorize that she might have aged up into a strong teenager, so she could fit in better and can face the game's harsh-like elements head on.

Wreck-It Ralph
Ralph's age is mainly swapped with Vanellope's, as he becomes the youngest of the two.

Mother Gothel
Gothel is well known in the fandom for using magic to turn back time of her old age so she could become young again. While young Gothel is mainly used in the fandom, there are those that use old Gothel for the fandom's AUs like Snow White &amp; the Seven Dwarves AU, for when her true age serves as the Evil Queen's old woman disguise.

Penny Forrester
For the Pennida pairing, Penny commonly has her age switched with Merida's due to a magic wand that they both held and is commonly part of the ship.

In some fanvideos, Penny is used as M.K.'s younger/child self.

Nicholas St. North
While North's "old" age is commonly used in the fandom, some fans however prefer to use his younger self that is seen in the Guardians of Childhood books. Mostly for crossovers, AUs and even in fanwork like fanfiction or fanart.

Lewis Robinson
Since both Lewis's child and adult self were seen in Meet the Robinsons, it gives fans the option of which "Lewis" they would like to focus on.

Franny Robinson
Since both Franny's child and adult self were seen in Meet the Robinsons, it gives fans the option of which "Franny" they would like to focus on.

Mary Katherine
In some fanvideos, M.K. is used as Penny's teen or adult self.

Mamá Coco
Because Coco is the titled character of the 2017 Pixar film, fans like to imagine what it would be like if the film was about her instead of her music loving grandson Miguel; by featuring her as a fourteen year old girl.

Queen Elsa
Elsa's age is mainly swapped with Anna's, as she becomes the younger sibling. There have also been fans that have Elsa the same age as Anna, for fun.

Princess Anna
Anna's age is mainly swapped with Elsa's, as she becomes the older sibling. There have also been fans that have Anna the same age as Elsa, for fun.

Zephyr Haddock
Because Zephyr looks like a child version of a brown haired Astrid, a few fans believe that Zephyr's older appearances would have her looking closely like her mother.

Nuffink Haddock
Because Nuffink looks like a child version of a blond haired Hiccup, a few fans believe that Nuffink's older appearances would have him looking closely like his father.

Articles/Links

 * BH6 AU Ideas | Age Swap