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Accident statistics show that the thorax is one of the most frequently injured body regions in drivers who sustain severe injuries in frontal car crashes. Thoracic injuries are more significant for the elderly than for adults. However, there are no injury assessment tools accounting for differences in anatomical features and material properties between adults and the elderly. The current study developed adult and elderly FE thorax models for investigating thoracic injury mechanisms for each generation. The ages represented by these models were defined as 35 and 75 years old (y.o.), respectively, based on the age distribution from accident statistics. The FE meshes representing the external shapes of the thoracic skeleton were first created based on the thorax CT images of the individuals with approximately average body sizes of males in their 30’s and 70’s.