P4–073: Prevalence of preclinical Alzheimer's disease among young adults: The Gipuzkoa Alzheimer Project study. (1st July 2013) - Martinez‐Lage, Pablo; Izagirre, Andrea; Ecay‐Torres, Mirian; Estanga, Ainara; Clerigue, Montse; Diaz, Zigor; Otaegi‐Arrazola, Ane; Altena, Ellemarije; Lainez, Maider; Otaegui, David; Gorostidi, Ana; Linazasoro, Gurutz