In this chapter two relatively simple applications of HealthAgeingMod illustrate the type of findings that can be expected from the model-system. The first addresses the question of what the benefits and costs might be of Australia’s obese adults reducing their weight by 10%, through themselves adopting healthier lifestyles. The second is about the likely health and health expenditure impact of the projected ageing of Australia’s population. The aim is to provide readers with an initial idea of the type of issues the model-system can handle, as well as the routine outputs it can produce. A much more complex and policy relevant application is presented in Chapter 8.