Nov 19, 2025 Yul So www.scientificamerican.com Using more than one language in daily life may slow biological aging in older adults, according to a study published in Nature Aging. An international team led by Professor Agustín Ibáñez of Trinity College Dublin analyzed data from more than 86,000 people across 27 European countries, with an average age of 66.5. The researchers examined the “biobehavioral age gap,” a measure that compares a person’s actual age to an age predict