ねんれい年齢nenrei
1.

The number of years a person has lived since birth, indicating how long they have existed in the world.

2.

A measurement used to categorize individuals based on their time of birth, often reflecting physical, mental, or social characteristics associated with different stages of life.

3.

A way to classify individuals into specific groups, often utilized in sociological contexts, based on shared age or generational characteristics.

4.

The duration of life measured in years, which can influence a person's capabilities, experiences, and societal roles.

Example:

おじいさんの年齢は僕の年齢の5倍だ。

ねんれいさ年齢差nenreisa
1.

The numerical gap in years between individuals, often influencing their life experiences and perspectives.

2.

The disparity in age that may affect relationships, social dynamics, or generational viewpoints.

3.

A distinction in age that can lead to varying levels of maturity, knowledge, or life stages among people.

Example:

彼らの年齢差は六歳です。

ねんれいそう年齢層nenreisou
1.

A classification or division of individuals based on their age, typically grouping them into specific ranges or generations to analyze social or demographic characteristics.

2.

A layer or stratum formed by categorizing people into segments that share similar ages or age intervals, often used for statistical or sociological purposes.

Example:

しかし、その利点は、あらゆる年齢層で大きな意味を持っているのである。

せいしんねんれい精神年齢seishinnenrei
1.

A measure that indicates the level of cognitive development expressed as an age, derived from intelligence tests, which reflects how a person’s mental abilities compare to typical age-related expectations.

2.

An informal assessment of one's maturity level based on attitudes, behavior, and thought processes, which may differ from their chronological age.

ねんれいじゅん年齢順nenreijun
1.

人々を年齢に基づいて並べたり、グループ分けすること。

2.

年齢の高い者から低い者へ、またはその逆に配置することに関する順序や列。

3.

特定の状況や文脈において、年齢を基準にした階層や順序の形成。

Example:

彼らは年齢順に座った。