Sylvia Villeneuve, McGill University (IMAGE) McGill University Caption Sylvia Villeneuve shows that the difference between a person's age and the age of their parent at the onset of the disease is a more important risk factor than their actual age. Credit Douglas Mental Health University Institute; CIUSSS de l'Ouest-de-l'Île-de-Montréal Usage Restrictions Please use photo credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.