A system is disclosed for estimating a person's life expectancy and for providing customized advice for improving the person's life expectancy. The system may, for example, be accessible to the person through a website, which may provide the person with a questionnaire containing questions to which the person responds. The system calculates and provides the person with an estimate of the person's life expectancy based on the person's responses to the questionnaire. The system may provide the person with the estimated life expectancy free of charge, while requiring the person to pay a fee for health-related feedback that is tailored to the person and intended to enable the person to increase his or her life expectancy. The system may be customized for entities such as insurance companies and corporate human resources departments so that their clients and employees may receive feedback that is specific to each user.