Is Lifelong Learning worth prioritizing?

The evidence linking continued mental engagement to dementia risk is unusually self-aware about its own biggest weakness -- reverse causation, where early undetected cognitive decline reduces a person's activity levels rather than inactivity causing decline -- and several recent studies were designed specifically to address it. Weighing that against the numbers, Lifelong Learning is worth watching rather than prioritizing yet — the potential upside is rated high (55/100), but the evidence supporting it is only moderate (62/100).