“Becoming a young adult, I subconsciously realized that what people liked about me was the child that was disappearing, and I didn’t know what was taking its place,” she told Closer Weekly in 2018. “So I didn’t know what to do or what parts to play.” Despite the tough transition from being a child star to taking on adult roles, Mills’ acting career marched on, and she’s still working today. She’s also a grandmother of four and a published author. Read on to learn more about her life at 75. RELATED: She Played Leather Tuscadero on Happy Days. See Suzi Quatro Now at 71. Mills’ career was so active throughout the ’60s that it did slow down as the years went on—but that’s not saying much. Some of her roles as an adult have included the ’80s TV series Good Morning, Miss Bliss (which later was reworked into Saved by the Bell), three Parent Trap movie sequels, and appearances on The Love Boat and Murder, She Wrote. More recently, she starred in the series Wild at Heart from 2007 to 2012. In 2014, she appeared in Midsomer Murders. Last year, she was in the British movie Last Train to Christmas. “I don’t think I’ll ever retire,” Mills told the Mirror in 2019. “For me, the need to work is constantly there.” In 2021, Mills published her memoir, Forever Young. The book covers her experience as a child star, including losing a large portion of the money she made as a child due to a tax law in England at the time. She also shares details about relationships, including her marriage to filmmaker Roy Boulting and a date she went on with the Beatles’ George Harrison. “The Hollywood that I knew has gone, so I really enjoyed going back and visiting those places in my memory,” she told The Hollywood Reporter of writing the book. “It was sort of agony and ecstasy.” RELATED: This Former Child Star Just Revealed How She Lost Her $17 Million Fortune. Mills was diagnosed with breast cancer in 2008 and has been in remission for many years. “I felt like I was in a surreal painting,” Mills told Closer of being diagnosed. “My reaction was: This is the biggest challenge I’ve ever had. I’m going to find out what I’m made of, and I probably need this because I’m going to learn a lot. You want to make it as easy as you can for the people you love, and that helps you deal with it.” Asked if she was in remission, she responded, “Absolutely. Remission sounds like, ‘Oh well, it can come back.’ No. It’s over.” Mills has four grandchildren through her two sons: Crispian Mills, who she shares with Boulting, and Jason Lawson, who she welcomed during her relationship with actor Leigh Lawson. “I’m so lucky in that they all live less than an hour away from us,” Mills told the Mirror of her family. “They are such a joy, and I take complete advantage of being a grandmother, and spoil them.” RELATED: For more celebrity news delivered right to your inbox, sign up for our daily newsletter. Mills has been with her partner, actor Firdous Bamji, since 1997. When the Mirror asked why they never married, she responded, “If it ain’t broken, why fix it? We are as good as married and feel as married as we could ever be.” In 2020, Mills spoke with Disney’s D23 about being named an official Disney Legend.ae0fcc31ae342fd3a1346ebb1f342fcb “It means a lot,” she said, “because Disney means a lot. Walt [Disney] means a lot. My years working with Disney on the lot or other places in the world were wonderful experiences. It represents formative years of my life, and it’s deeply embedded in my heart. I was so fortunate to have that start with this wonderful man and his wonderful studio, so it means a great deal.” RELATED: Shelley Fabares Played Mary on The Donna Reed Show. See Her Now at 77.