- Learning another language could slow brain ageing by up to 13 years.
- Speaking multiple languages is associated with younger-appearing brains, with more languages and earlier acquisition linked to greater benefits.
- Study of 728 people used AI and brain scans to measure connectivity, finding multilingualism delays age-related decline in memory and speed of thought.
- Higher proficiency and earlier second language learning enhance brain resilience, with effects seen as a gradient rather than a binary bilingual/non-bilingual divide.