Hilary Duff opened up about a past age-gap relationship in her latest single, Mature, sparking conversations online about her teenage years and early romances.

The track, which she co-wrote with husband Matthew Koma, is a semi-autobiographical reflection on a relationship she had with an older man when she was just a teenager.

Fans are now speculating if the song references Duff’s former relationship with Good Charlotte frontman Joel Madden, whom she dated back in 2004.

Hillary Duff described the vulnerability and lessons behind her song in an interview with Vogue

One decade since her last album, Breathe In. Breath Out.,” Hillary Duff has come back with a single, Mature. The song was written by Duff and her husband, Matthew Koma, as well as Madison Love, according to ELLE.

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