I think that Little Critter must be somewhere between four and six years old, because my four-and-a-half year old "little critter" acts an awful lot like this one.
The genius of Mercer Mayer's Little Critter books is that he takes ordinary, everyday situations and he shows them from the point of view of a young child. That sounds easy to do, but it's not. That's why kids like the books. That, for and the peanut butter and pickle sandwiches.
As a mom and a dubious adult, I laugh out loud at these stories, not necessarily because of what Little Critter does, but because of the expressions on the grown-up faces. More than once they have mirrored my own. Although, I don't have a problem with peanut butter and pickle sandwiches, as long as the pickles are sweet and not dill.