Most cartoon characters don't age. They stay at an unspecified age throughout a series. Every now and then there's a "baby" or "grown up" series with the character, but rarely will a character age in a gradual process. What characters can you think of that grew up in such a gradual way?
For me the first that comes to mind is Max Goof, Goofy's son from Goof Troop. In Goof Troop, a pair of Goofy movies and some other Disney series, we have seen Max grow from a child into a young adult in a semblance of real time. This is made fairly ironic if you consider that Goofy is the only character in the Disney Trio without a set girlfriend, but the only one with a child of his own.
Also the whole Dragonball cast. Through all the Dragonball series, we saw almost the whole life of a great many characters.
For me the first that comes to mind is Max Goof, Goofy's son from Goof Troop. In Goof Troop, a pair of Goofy movies and some other Disney series, we have seen Max grow from a child into a young adult in a semblance of real time. This is made fairly ironic if you consider that Goofy is the only character in the Disney Trio without a set girlfriend, but the only one with a child of his own.
Also the whole Dragonball cast. Through all the Dragonball series, we saw almost the whole life of a great many characters.