Sir Richard Branson has announced the devastating death of his wife Joan, describing her as his “best friend, my rock, my guiding light, my world” after five decades side by side.

The Virgin founder, 75, confirmed that Joan, who had just turned 80 this summer and was believed to be in good health, passed away peacefully. The couple married in 1989 on Necker Island and built a tight-knit family together, raising daughter Holly, 44, son Sam, 40, and doting on their five grandchildren — Etta, Artie, Lola, Eva-Deia and Bluey.

Just last week, Sir Richard had shared a tender photo kissing Joan on the head, writing that “everyone needs a Joan in their life” — a message that now reads like a painful farewell.

Tributes have poured in from friends across the world. Spanx founder Sara Blakely said she was “heartbroken,” telling Richard she was “so glad you had each other for so long.” TV host Andrea Minski also sent her love, recalling how Joan “shared the best mom advice” during their annual stays on Necker Island and how she treasured their “conversations over champagne.”

Sir Richard also reflected on the moment he first met Joan back in 1976 at The Manor, Virgin Records’ legendary live-in studio. He remembered falling for her “almost from the moment I saw her,” movingly recalling how the “down-to-earth Scottish lady” was the one person who wasn’t impressed by his antics.

Today, he said simply: “Love you forever, Joan.”