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This paper reports a series of experiments on 6, 7, and 15 year-old pediatric post-mortem human subjects (PMHS) undertaken to guide the scaling of existing adult thoracic response data for application to the child and to assess the validity of a juvenile porcine abdominal model. The pediatric PMHS exhibited abdominal response similar to the swine, including the degree of rate sensitivity. The thoraces of the PMHS were as stiff as, or slightly more stiff than, published adult corridors. An assessment of age-related changes in thoracic stiffness supports the authors' earlier suggestion (2009) that the effective stiffness of the chest increases through the fourth decade of life and then decreases, resulting in stiffness values similar for children and elderly adults.