How many studies support Lifelong Learning?

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. That's backed by 5 published studies in Vitaebase's database, including 1 meta-analysis, the most recent from 2025 -- a modest but real research base.