Is Cutaneous T-Cell Lymphoma a Death Sentence?

Hi, I’m 61 years old. Not 100% diagnosed yet. They still have to do a genetic organization test. But biopsy came back with elevated white blood cells and lymphatic infiltrates.
My red patch is in my groin area on the right side about the size of a small 5” pancake. It is red but faint, not raised, a little shiny, but no itching or cracking. No night sweats, no fever, no cuts or bleeding. Not presenting as advanced. Dermatologist is unsure and sending me to oncologist. I’m seeing “5 years to live” all over the internet and it’s scaring me to death. I just got the news today. While it’s not definite should I be worried about a short timeline? Can the biopsy showing elevated t-cells not necessarily be cancerous? If they are cancerous, what is my life expectancy. I do have a pre-existing lung disease/immune related, that has been in remission for 11 years. I’m healthy with perfect weight for my height, workout and run 3.5 miles daily. Drink only one light alcoholic drink per week. Do not smoke. I’ve only had this red patch for seven weeks. Please help provide some information if you can. Thanks, Paul