There is no specific time for how long you can live at 85 with a brain tumor pressing on a nerve. Benign tumors develop at a slower rate and will have a longer survival period even without surgery. In case of malignant tumors, life may be affected in the short term. 1. Benign brain tumor: For benign brain tumor compressing brain nerves, if you cooperate with doctors for surgical treatment in time, and remove the tumor completely, it may not affect life, and you can even survive for a long time like normal people. 2. Malignant brain tumor: if malignant brain tumor, even if timely surgery or radiotherapy and other comprehensive treatments are carried out, if metastasis or recurrence occurs, then the survival period may be very short, about several months or half a year or so, the specific time depends on the specific situation. There is no very accurate time for how long an 85-year-old brain tumor compressing the nerves can live, and it is recommended to follow the doctor’s instructions for timely treatment to avoid endangering life.