Core Insights - Japan faces a significant challenge in protecting household wealth as cognitive decline among older adults becomes more prevalent, with half of the nation's GDP controlled by this demographic [1] - The situation serves as a warning for other aging countries, notably the U.S., where older adults with cognitive decline manage approximately $6 trillion in assets [2] Demographic Trends - In 2023, nearly one-third of Japan's population was over 65, with more than 10% over 80, and an estimated 4.6 million individuals suffering from dementia [3][4] - The U.S. demographic is less severe but trending similarly, with 18% of the population over 65, a 4% increase since 2014, and projections indicating significant growth in this age group [5][6][7] Economic Implications - The financial burden of dementia on families and public spending is substantial, leading to increased pressure on Medicare and Medicaid, and often depleting family savings [6] - The ripple effects of dementia include weaker intergenerational wealth transfers, rising poverty levels, reduced discretionary spending, and potential tax increases to support public systems [7]