Wallace and Gromit pleases younger because the cartoon yet realistic clay look.Also the fact it has no mature content. It also has easily adorable and lovable characters that can appeal to all ages. It also appeals to adults because the humor is not at a level of immaturity that many shows are at now and the humor can be understood by everyone. It also appeals to adults with the art style that stand out from today's.
Wallace and Gromit is able to please younger and older audiences, because they have a special clay look that is charming and gives off appeal. And their movies do not give off any boredom or make someone get bored while watching the short movies of Wallace and Gromit, it has such things like putting in a both a mix of satire and slaptick and less obvious comedic parts that appeal to both adult and younger audiences. So it can be more fun and less boring to watch, plus it is also memorable too, and because of the popularity, it helped to also bring a new series named Shaun the Sheep in 2007, to people who knew Shaun from "Wallace and Gromit: A Close Shave" or people who were new to Shaun. That is why Wallace and Gromit can please younger and older audiences.
