平へい均きん寿じゅ命みょう

noun

life expectancy; average life span

Commonly used in demographic and health contexts to refer to the expected number of years a person will live from birth.

• 日本にほんの平へい均きん寿じゅ命みょうは世せ界かいでもトップクラスです。

  Japan's life expectancy is among the highest in the world.

• 平へい均きん寿じゅ命みょうが延のびるにつれて、年ねん金きん制せい度どの見み直なおしが必ひつ要ようになる。

  As life expectancy increases, the pension system needs to be reviewed.

noun

mean lifetime

Physics term for the average time a particle or system exists before decaying or changing state.

• ミュー粒りゅう子しの平へい均きん寿じゅ命みょうは約やく2.2マイクロ秒びょうです。

  The mean lifetime of a muon is about 2.2 microseconds.