By Year of Creation:
* Mickey Mouse: Created in 1928, Mickey Mouse is widely considered the oldest Disney character. However, he was originally called "Steamboat Willy" and only later became Mickey.
* The Skeleton Dance: This animated short was released in 1929, featuring a group of skeletons dancing.
By Age Within the Story:
* The Fairy Godmother: From Cinderella (1950), she is portrayed as ageless and magical.
* Maleficent: From Sleeping Beauty (1959), she appears to be very old, though her exact age is never stated.
By Internal Disney Universe:
* The Genie: From Aladdin (1992), he is stated to be over 10,000 years old.
* The Ancient One: From Doctor Strange (2016), this character is a powerful sorcerer who has lived for centuries.
Ultimately, the answer depends on what you define as "oldest." If you're looking for the oldest in terms of creation, then Mickey Mouse is the winner. However, if you're looking for age within their respective stories, the answer is more ambiguous.