I’m similar to you, 70 yo, 2 kids, 2 grands, 1 ER/PR+ ductal carcinoma - but not invasive. I did radiation and am on tamoxifen - when you get to the decision on hormone therapy ask me about tamoxifen if you need an opinion.
One thing I wished I had done prior to surgery is pay more attention who is my assigned nurse (clinical nurse, team nurse, after surgical care nurse). She’ll probably be around Monday before surgery. The nurse is usually the first on your team to help you with after surgery issues, like questions concerning the drains, or skin/suture questions. They usually field your concerns to the doctor and can be enormously helpful - I wish I had made a face connection to who mine was. There were so many people providing care I couldn’t keep up with which one was the PA, NP, CNA, or tech. But help from the care nurse can make a difference.

I’ll keep you in my prayers on Monday!