The ageing process is characterized by declines in physical and cognitive function. However, the relationship between these trajectories remains a topic of investigation.

中文翻译：

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1936 年洛锡安出生队列中下降的身体和认知功能之间的关联。

衰老过程的特点是身体和认知功能下降。然而，这些轨迹之间的关系仍然是一个研究课题。