Benjamin "Benny" Alden is the youngest of the Boxcar Children, at age six. He is called Benny by his siblings, and is almost always hungry. He can sometimes be a nuisance. He can't read very well, but tries hard. Benny is also sometimes called Ben, Benjamin, or 'Old Man' by Henry. He finds it very easy to make friends. His favorite color is red. He is shown to be at least fifteen years old by the nineteenth book

He is the only character given a specific birthday, July 15 (book 18). This makes his birthstone a ruby, which matches his favorite color.