The Mystery Gang in Scooby-Doo has seen a number of different depictions, and their original ages are never written in stone. Created by Joe Ruby and Ken Spears for Hanna-Barbera studios, the original series, Scooby-Doo, Where Are You? ran for two seasons, offering slapstick humor and light-hearted crime-solving action. The beloved series has been a consistent staple of youth culture since, with dozens of movies and TV series spin-offs.
The characters of the Mystery Gang have remained almost entirely consistent since the original series. Though an occasional guest star, such as Scrappy-Doo, will appear, the franchise is at its best with the original gang. The paradigm of these characters is important to the show's charm and comedy. However, individually, the characters are subject to change, and different adaptations have seen them at different ages, allowing the franchise to be adaptable and timeless.
How Old Scooby-Doo's Main Characters Are In The Original Cartoon
According to notes written by original creators Joe Ruby and Ken Spears, which is the most directly reliable source, Fred and Shaggy are both 17, Daphne is 16, and Velma is 15 years old. Scooby is meant to be 7. These were their ages in the first season of Scooby-Doo Where Are You? In the second season, they had all aged a year. After that, the details get a little foggy and are mostly up to viewer interpretation.
Traditionally, the characters have to be old enough to drive, but young enough to still be kids, hence the classic villain line "I would have gotten away with it too, if it wasn't for you meddling kids!" Placing them in the 15-18 range seems most accurate, even if the show runners' notes aren't considered canon. Originally, the mystery gang had all met in high school, so their ages wouldn't be more than a few years apart.
How Old Scooby-Doo's Characters Are In Other Adaptations
With any franchise, different adaptations take different approaches to character's details. Scooby-Doo has many different adaptations, from TV shows, to movies, to comics and more. In the live-action Scooby-Doo adaptation in 2002, the mystery gang are played by actors in their mid to late 20s, with Shaggy's actor, Matthew Lillard, even being 32 at the time. This adaptation seemed to portray them as being adults, having already been working together for some time, despite still wearing their traditional, youthful outfits. In other adaptations, like A Pup Named Scooby-Doo, the characters are younger, at middle school age.