Long life to you! With a diagnosis of cancer, don't give up! speak frankly with your doctors as to the extent & aggressiveness of your particular tumor. Treatment options are almost as varied as there are cancers to treat. Your medical team will help you choose the one right for your cancer type, age, resources, & comorbidities. No one will fault you, once fully informed, if you opt for a less aggressive approach.
Normal life spans. ...Are common with some cancers. Other cancers are quite devastating and might result in death in days. It really depends largely on the type of cancer and the treatment received (or not received).