* Age: The definition of "pop star" is subjective. Some might consider singers who have had one hit song a pop star, while others may only consider established artists with extensive careers.
* Current relevance: Many pop stars who were on Disney Channel may have transitioned to other genres or have had their careers decline.
* Channel variations: Disney Channel has different branches around the world, each with its own programming and artists.
However, some contenders for the title of oldest pop star on Disney Channel might include:
* Britney Spears: While she's known more for her post-Disney career, she did appear on the Mickey Mouse Club in the early 1990s.
* Christina Aguilera: Similar to Spears, she rose to fame after her time on the Mickey Mouse Club, but her Disney roots are undeniable.
* Justin Timberlake: Another Mickey Mouse Club alum, Timberlake has become a global pop icon.
* Ryan Gosling: While not known for his singing career, Gosling was also on the Mickey Mouse Club and might be considered a pop star of sorts.
Ultimately, determining the "oldest" pop star on Disney Channel is a matter of interpretation and depends on how you define "pop star" and "relevance."