Despicable Me 4 director Chris Renaud has revealed why nobody in the movie has aged since the last installment, explaining the approach to the characters in the latest film. The newest entry in the animated comedy franchise sees Gru (Steve Carell) and his family forced to relocate after a villain from his past, Maxime Le Mal (Will Ferrell), returns seeking revenge. While the movie takes place some time after the end of the third film in Despicable Me‘s chronology, the characters haven’t aged since their debut in the first movie.

https://screenrant.com/despicable-me-4-character-ages-director-response/