Old age; advanced age — a formal/neutral term often used in official or written contexts (e.g., old-age pension, aging population).
老齢年金は一定の年齢に達した人が受け取る給付だ。
Old-age pension is a benefit received by people who have reached a certain age.
医師は老齢による体力低下を指摘した。
The doctor pointed out the decline in physical strength due to old age.
社会の老齢化が進むと介護の需要が増える。
As the population ages, demand for elder care increases.