Every foreigner who studies Japanese eventually encounters the same wall: keigo. Polite language, honorific language, humble language — the same idea expressed in completely different words depending on who you are talking to. Why does Japanese have such a complex system of speech levels?
The answer lies in the hierarchical structure of Japanese society. And the two factors that most determine where someone sits in that hierarchy are age and length of employment.
What Is Keigo?
Keigo is the system of speech levels in Japanese that adjusts language according to the relationship between speaker and listener. It has three main categories.
Teineigo — polite language The baseline of polite speech, built around the use of “desu” and “masu” verb endings. Used in everyday polite conversation with anyone you are not on close terms with.
Sonkeigo — honorific language Language that elevates the actions and status of the person you are speaking to or about. Where ordinary Japanese says “suru” (to do), sonkeigo says “nasaru” or “irassharu.”
Kenjougo — humble language Language that lowers the speaker’s own actions in order to elevate the other person. Where ordinary Japanese says “suru” (to do), kenjougo says “itasu” or “mairu.”
Why Age Determines Keigo
In Japan, age establishes the basic order of a relationship. The general rule is simple: if someone is even one year older than you, you use keigo with them.
This is rooted in Confucian influence, which placed respect for elders among the most important social virtues. That philosophy has been deeply absorbed into Japanese culture and continues to shape daily interaction.
In school, students in the same year speak to each other in casual language — tamego. But even one year’s seniority changes the dynamic entirely: a first-year student uses keigo with a second-year, without exception. This pattern continues throughout adult life.
Why Length of Employment Also Matters
In the Japanese workplace, it is not only age that determines hierarchy — the length of time someone has been with the company is equally significant.
Even if two colleagues are the same age, the one who joined the company first is the senpai — the senior — and is treated accordingly. A new employee is expected to use keigo with a same-age colleague who joined even one year earlier.
The underlying logic is a respect for experience and institutional knowledge. Someone who has been in the company longer knows more about how it works, and that knowledge is honored through language. For foreigners, this can feel genuinely complicated — and it is.
How This Plays Out in the Workplace
The relationship between age, seniority, and keigo surfaces in almost every aspect of workplace interaction.
Forms of address Seniors and managers are addressed as “〇〇-san” or by their title — “〇〇-buchou” (department head), for example. Colleagues who joined at the same time — douryou or douki — are often addressed by name. Those more junior may be addressed with casual suffixes like “kun” or “chan.”
Conversation style Keigo is used with seniors and managers. With same-cohort colleagues, casual speech is common. With junior staff, a somewhat relaxed register is standard.
Written communication Business emails adjust in formality depending on the recipient. Messages to managers and clients use full keigo; messages to peers or junior colleagues use a more relaxed style.
Where Foreigners Often Struggle
The intersection of age, seniority, and keigo is one of the most genuinely difficult aspects of Japanese workplace culture for foreigners to navigate.
Being asked your age In Japan, asking someone’s age when you first meet them is relatively common — partly because it helps establish who should be using keigo with whom. For foreigners, the question can feel intrusive. Understanding its practical purpose makes it easier to receive.
Speaking too casually Foreigners learning Japanese sometimes use casual speech — tamego — with people who are older or more senior, without realizing it. This can come across as disrespectful. That said, Japanese people tend to be considerably more patient and forgiving with foreigners in this regard than they would be with a native speaker.
Clashing with flat organizational cultures Foreigners from Western work cultures — where calling your boss by their first name is often the norm — can find Japan’s keigo-based hierarchy jarring. The adjustment can take time, but understanding why the system exists makes it easier to work within.
A Culture in Transition
In recent years, particularly in startups and globally oriented companies, Japan’s workplace keigo culture has begun to shift.
Some companies have moved toward flat structures where everyone addresses each other with the neutral “-san” suffix, regardless of age or seniority. But in traditional Japanese organizations, the hierarchy encoded in language remains firmly in place.
What Keigo Reveals About Japan
Japan’s keigo system is not simply a set of grammatical rules. Embedded within the language itself are values — respect for elders, deference to experience, and a recognition of the order that holds groups together.
Learning keigo is not just learning Japanese. It is learning how Japanese society understands respect, hierarchy, and the relationships between people. And that understanding goes a long way toward making sense of Japan.