...研究往往将重点放在研究老年人功能的平均缺损状况,并将老龄化分成两类：受损的老龄化(impaired aging)和正常老龄化(normal aging),这种分类掩盖了功能没有受损的老年人之间的巨大差异。
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第一种发表于2004年，我们发现正常老龄化的双语者的认知功能比正常老龄化的单语者的要强。
In the first, published in 2004, we found that normally aging bilinguals had better cognitive functioning than normally aging monolinguals.
北卡罗来纳州杜克大学人口统计学家肯尼斯·曼顿说：“这确实引发了一个问题，即什么是正常的老龄化。”
"It really raises the question of what should be considered normal ageing," says Kenneth Manton, a demographer from Duke University in North Carolina.
老龄化降低了身体的能力，以恢复和生产的正常软骨。
Ageing decreases the body's ability to restore and manufacture normal cartilage.
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