My grandma was passed away from melanoma when she was 67 about 20 years ago. She was 65 when she was first diagnosed with it. Unfortunately, she was already at stage 4 then. I heard that the median survival is 6-7 months at stage 4. However, my grandma still lived more than 9 months. She is out live her life expectancy at that time. About 20 years passed, people have learned much more compared with that time. Don't give up. I sincerely wish you the best!