Well, apparently they were back then and still are today for people of all ages.
Coloring books for adults is an offspring of art therapy which is a mental health profession that is the process of making and creating artwork which intends to "explore feelings, reconcile emotional conflicts, foster self-awareness, manage behavior and addictions, develop social skills, improve reality orientation, reduce anxiety and increase self-esteem" (according to the American Art Therapy Association). So basically, it's similar to good old therapy. Also, art therapy is not only about mental health and improving yourself - it's a form of personal expression, as well.
As already stated, the most widespread coloring books offer animation heroes as well as pets or countryside animals. Kids really like cartoons and household pets, thus, every kid will love interesting coloring pages which may vary in difficulty. A lot of color printables have three to four colors and figures, whilst you can buy more complicated ones as well (more than 10 colours). Making use of games in teaching turned out to be a professional methodology across the world. In addition, dads and moms may make use of color printables outside school to get ready little ones for kindergarten. The key benefit of this technique is the fact that children find it irresistible! You might also motivate your kids by offering prizes and also awards for picking the proper colours.