John Stamos: Dave Coulier is back to himself John Stamos says his friend Dave Coulier is "100 percent back to" himself after battling cancer. 20 August 2025 Dave Coulier is "100 percent back to" himself after battling cancer. John Stamos' friend Dave Coulier is much better The 65-year-old actor revealed in March he had been diagnosed with stage 3 non-Hodgkin Lymphoma and five months later was delighted to tell fans he was cancer free, and his friend and Fuller House co-star John Stamos is thrilled to see his old pal back to good health.