You need to gather all of the info you can and then discuss your options with your doctor(s). I had just turned 62 when I was diagnosed over 4 years ago. I chose a unilateral mastectomy, chemo, rads, and am now on a hormone blocker. When asked why I chose a unilateral rather than a bilateral mastectomy I tell them the other one was and still is healthy. I have a yearly mammogram on that breast, still see my Oncologist every 6 months, and my RT once a year. Everyone's cancer is unique to them hence a treatment plan is individualized. Take a deep breath and try to relax and you will be fine.