"Preventing brain aging" 这个说法的英文表达是 "cognitive aging prevention" 或 "brain aging prevention"。
来源：大脑老化是指随着年龄的增长，大脑的认知能力减退的现象。随着人类对长寿的追求，研究预防大脑老化成为了重要课题。
例句 1: "Eating a healthy diet and exercising regularly can help prevent cognitive aging."
(坚持健康饮食和锻炼可以帮助预防大脑老化)
例句 2: "Stimulating your brain through activities such as reading and solving puzzles is also important for brain aging prevention."
(通过阅读和解谜等活动刺激大脑对于预防大脑老化也很重要)