ACROSS THE LIFESPAN
Bilingualism & Aging
Why a second language may protect your brain
Speaking two languages doesn't just double your vocabulary. It may add years to your cognitive health. Research suggests that lifelong bilingualism can delay the onset of dementia symptoms by 4 to 5 years compared to monolingual speakers. That's a bigger effect than any currently available medication for Alzheimer's disease.
In real life...
It's not too late to start. Even learning a second language in adulthood activates these same executive control networks. You don't need to become fluent; regular practice with a language app, conversation partner, or class provides the kind of cognitive switching exercise that builds reserve. The key is consistent engagement, not perfection.