Basic version of the component-based models typically use health expenditure estimates broken down into major spending categories and age classes. All of these data requirements are generally recorded in databases in OECD countries and often cover a relatively long time span. Similarly, demographic projections are often regularly produced and updated. However, the development of more sophisticated versions of the component-based models could require additional information, such as health spending broken dowm by gender and disease categories, by descendent and survivor status or by end-of-life costs.