“老死” 最常見的英文翻譯是：

**die of old age**

或者更簡潔地表達為：

**die old**

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**例句：**
- 他最終在睡夢中老死了。
- He eventually **died of old age** in his sleep.

- 我希望我能安詳地老死，而不是因病去世。
- I hope to **die old** peacefully, rather than from an illness.

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**其他相關表達：**
- **natural causes** (自然原因，通常包括年老)
- 例如：The coroner ruled that he died of **natural causes**. (驗尸官裁定他死于自然原因。)

所以，根據具體語境，**die of old age** 是最直接準確的翻譯。