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What should a 40 year old be able to do? A guide to healthy aging

The brain begins to show subtle signs of shrinkage as early as the thirties and forties, but that doesn't mean it's downhill from here. Addressing the question of **what should a 40 year old be able to do** involves understanding that this decade is a pivotal period for setting a strong foundation for future health and longevity. It is a time for proactive self-assessment and strategic planning.