I have absolutely no intention of retiring.

Literal

Retire [intention-つもり] [topic-は] not-even-a-hair not-exist.

毛頭ない (もうとうない, 'not in the slightest, absolutely not') — literally 'not even a hair.' An emphatic total negation. つもりは毛頭ない ('have absolutely no intention'). Subject omitted — the speaker is understood.