2-positive breast cancer stage 1 level 3 how much longer to live what to expect 70 years old?

HER 2?: I believe you are saying a Stage 1, Her2+ tumor at 70 years old (please correct). This is a very favorable tumor with good treatments (Herceptin). The 5 year survival rates are over 95%. Provided this person is otherwise healthy, she should do very well. I recommend speaking with your oncology team and getting addition and specific information related to this case.