老いる (oiru) conjugation
to age, to grow old
老いる (おいる, oiru) is an ichidan verb. Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes. Every form below is tappable — hear it, then say it back.
Conjugation table
| Form | Plain (casual) | Polite (~ます) | When you use it |
|---|---|---|---|
| Dictionary / plain | 老いる oiru | 老います oimasu | The form you look up. Also the casual present and future. |
| Plain negative | 老いない oinai | 老いません oimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 老いた oita | 老いました oimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 老いなかった oinakatta | 老いませんでした oimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 老いて oite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 老いている oiteiru | 老いています oiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 老いたい oitai | 老いたいです oitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 老いよう oiyou | 老いましょう oimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 老いられる oirareru | 老いられます oiraremasu | “can ~”. What you could do; the object often takes が. |
| Passive | 老いられる oirareru | 老いられます oiraremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 老いさせる oisaseru | 老いさせます oisasemasu | Make or let someone do it. |
| Causative-passive | 老いさせられる oisaserareru | 老いさせられます oisaseraremasu | Be made to do it — the long one. |
| Imperative | 老いろ oiro | 老いてください oitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 老いるな oiruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 老いれば oireba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 老いたら oitara | — | “if / when ~”. The everyday conditional. |
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Why it conjugates this way
Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes.
See the full rules on the verb conjugation guide.