老いる
おいる · oiru · JLPT N1 · verb-ichidan
to grow old
🦯 Sounds like oh, I'll: oh, I'll be old someday, and that's 老いる (oiru).
The kanji 老 means old, as in 老人 (an elderly person). The verb is built on that root and means to age or grow old.
老 — old man 耂 + 匕 (bent figure)
Originally a pictograph of an elderly person with long hair leaning on a cane. The top 耂 depicts the hair and stooped body, while 匕 at the bottom represents the cane or a bent figure. The core meaning 'old' has remained stable since oracle bone script.