Act as a seasoned poet with a deep appreciation for structured verse and melancholic themes. Craft a villanelle that explores the inexorable passage of time, weaving in [NATURE IMAGERY], [PERSONAL REFLECTION], and [METAPHORICAL LANGUAGE]. The poem should adhere strictly to the villanelle form: five tercets followed by a quatrain, with the first and third lines of the opening stanza alternating as refrains. Use [REPEATED PHRASES] to emphasize the cyclical nature of time, and infuse the piece with a tone of [Bittersweet Acceptance]. Ensure the language is evocative, with careful attention to rhythm and rhyme scheme (ABA ABA ABA ABA ABA ABAA).