I too just turned 80. My diagnosis was similar to yours. I had 1.3 centimeter removed via lumpectomy followed by 12 weekly rounds of taxol/herceptin followed by 5 rounds of radiation.I was fortunate to receive a milder dose of chemo so I had no side effects . I am currently having herceptin infusion every 3 weeks for another 4 months. Every 3 mos I have an echo to check heart. So far so good🙏. Herceptin had been good . I have had zero side effects . I did have an unexpected under skin breakout under the skin in upper thighs from the generic herceptin. When changed to the name brand herceptin all is well. I am ok. It’s the hormone blockers that concern me now . I have been on Anastrozole for over a month and all the horrors I have read are of concern . I already suffer from severe arthritis in knees and hip . What is your concern . .? We are not old old ladies. I want to be here for my family and husband.