It might be best to have a family conference with you, your siblings, and your mother's Medical Oncologist.
Age alone is not a factor in deciding to recommend chemotherapy. Rather, a patient's overall state of health, and their "performance status," are more important than age alone (although extremes of age must still be considered).
Sincerely,
Robert A. Wascher, MD, FACS
www.doctorwascher.com
Author, "A Cancer Prevention Guide for the Human Race" (2010)