Does Multilingualism actually make a difference, or is it overhyped?

Multilingualism has one of the more geographically consistent evidence bases in dementia research, though two recent meta-analyses converge on an important nuance: it appears to delay when symptoms appear, not whether dementia develops at all. Weighing the data: Multilingualism looks an early-stage, lower-priority area for now — the evidence is only moderate (67/100), and its estimated impact (46/100) is on the lower end too.