My dad got diagnosed at basically the same exact age with I think the same cancer what I think would have been him being diagnosed 20 years ago this past August. Felt fine until he got jaundiced and felt really tired...he got tested and for a second they thought it was just a clogged bile duct, but then they did the actual conclusive test and it very much wasn't.
He got chemo and was in a clinical trial for some immuno therapy...didn't get the surgery (it wouldn't have helped)...they had given him months, but with the immunotherapy he made it over a year and half...but yeah, basically same age of diagnosis and bile duct cancer as well.
Bigger reason I'm sharing is that immunotherapy has come incredibly far since then...I often think of what would have happened if it was now instead of then...also think a lot about the fact I'm 40 now, and in seven years I'll be the same age when he got diagnosed