Translation guide
In Japanese, referring to the eldest child depends on context: within the family, when talking about your own family to outsiders, or when talking about someone else's family. The most common and neutral term is 長男 (eldest son) or 長女 (eldest daughter), but other expressions are used in specific situations.
The most common way to refer to an eldest son, usable in most contexts.
Standard, neutral term for 'eldest son'. Used in both formal and informal settings, and can refer to one's own or someone else's eldest son.
彼は長男です。
He is the eldest son.
長男は医者になりました。
My eldest son became a doctor.
The most common way to refer to an eldest daughter, usable in most contexts.
Standard, neutral term for 'eldest daughter'. Used in both formal and informal settings, and can refer to one's own or someone else's eldest daughter.
長女は大学生です。
My eldest daughter is a college student.
彼女は長女としてしっかりしている。
As the eldest daughter, she is very responsible.
When referring to the eldest child without specifying gender, especially within one's own family.
Literally 'the topmost child'. A very common, natural way to say 'eldest child' in casual conversation, without specifying gender.
一番上の子はもう中学生です。
My eldest child is already in junior high school.
Short for 一番上の子, often used when the context is clear. Implies 'the older one(s)' but can mean 'eldest' if there are multiple children.
上の子が面倒を見てくれます。
My eldest child takes care of the younger ones.
Formal, somewhat literary term for 'eldest child' (gender-neutral). Rare in everyday speech; more common in written or formal contexts.
When speaking humbly about your own eldest son to someone outside your family.
Humble term for 'my son'. Often used to refer to one's own son in formal situations, but it doesn't specifically mean 'eldest'. Can be combined with 長男 for clarity.
愚息の長男が今年大学を卒業しました。
My eldest son graduated from university this year.
When speaking humbly about your own eldest daughter to someone outside your family.
Humble term for 'my daughter'. Similar to 愚息, it doesn't specify birth order, but can be used with 長女.
愚女の長女は来年結婚します。
My eldest daughter is getting married next year.
When speaking respectfully about someone else's eldest son.
Polite form of 長男, used when referring to another person's eldest son. The prefix ご adds respect.
ご長男はおいくつですか。
How old is your eldest son?
When speaking respectfully about someone else's eldest daughter.
Polite form of 長女, used when referring to another person's eldest daughter.
ご長女はとても優秀だと聞きました。
I heard your eldest daughter is very talented.
Used in official documents or family registers to indicate the firstborn child.
Means 'first child'. Often used in formal contexts like census forms or medical records. Gender-neutral.
第一子が誕生しました。
Our first child was born.
English speakers often try to translate 'eldest child' directly as 最年長の子供, but this sounds unnatural in Japanese. Use 一番上の子 or specify gender with 長男/長女.
In Japanese families, it's common to refer to children by their given names rather than birth order titles, especially when speaking within the family. For example, instead of saying 'my eldest son', you might just say 太郎 (Taro) if that's his name.
I feel the responsibility of being the eldest child.