Photo: Karen Cooke treasures the time with her granddaughter Paityn. (ABC News: Brendan Esposito) Karen Cooke loves reading to her granddaughter Paityn. But with her memory faltering, it’s not always easy. "Nanny," Paityn says, looking up at her grandmother. "You already said that." Dementia affects more than 400,000 Australians and is the country’s second-biggest cause of death Experts are warning of a dementia "tsunami" in the coming years The early results from two trials are giving patients — and potential patients — hope for the future It was incidents like this — the little things — that her family first started noticing. Ms Cooke, 54, was diagnosed with early-onset dementia two years ago — a disease she describes as being like "a disco haze" going through her head. "It was really confronting to start off with," she said. "I just don’t like the thought of not knowing what’s happening, […]