Agnieszka Chylińska is turning 50 today, marking a birthday that lands after more than three decades of a voice Polish listeners have heard across rock, television and pop reinvention. The singer, who first broke through with O.N.A., now reaches a new milestone with a career that has moved from rebellion to maturity without ever really losing its edge.

Her name is tied to one of the most important Polish rock bands at the turn of the century, and to a public image that was never easy to pin down. Before this birthday, she was remembered for a moment of raw defiance when, holding her first Fryderyk award, she shouted to her former teachers: “F**k off, nienawidzę was.”

That outburst became part of the Chylińska legend, but it was only one chapter. In 2009, she released the dance album “Modern Rocking,” a move that signaled how far she was willing to travel from the band frontwoman image that first made her famous. After that, she changed her styling and began emphasizing femininity more openly, a shift that showed up in the blond hair she wore on “Mam talent!” and in the many looks that followed, from straight black bangs to light dreadlocks and mohawks in a range of colors.

The transformation was not only visual. Chylińska is also a mother of three children, and the public version of her over the years has increasingly reflected a steadier family life alongside the stage persona that made her a star. The portrait that emerges on her 50th birthday is of a performer who has never stopped changing, but has also settled into a new phase on her own terms.

She has also written children’s books that reached the top of sales lists, adding another layer to a career that has stretched well beyond singing. What has not changed is her place in Polish culture: she remains a long-time figure whose name still carries the force of the voice that first came through with O.N.A., and whose own words now sound more reflective than furious. “Teraz chcę po prostu żyć,” she once said. On her 50th birthday, that may be the clearest summary of where agnieszka chylińska stands now.