I was diagnosed with ILC last February and felt the same way. I also opted and had a bilateral mastectomy to avoid the cancer from coming back. I was also stage 1A grade 2. Following biopsy of the sentinal node after the mastectomies I had clear lymph nodes. I opted for gel implants because recovery from flap surgery was so much longer. I am also 70 and felt this gold standard approach was right for me. Expanders were inserted above the muscle wall immediately after the mastectomies were performed that day. Two months later the implants surgery was done and both surgeries were pain free. My plastic surgeon used fat grafting from my body to soften the implants.

There is a great book you can find it on Amazon that really helped me make my decisions.

Breast Cancer Treatment Handbook: Understanding the Disease, Treatments, Emotions and Recovery from Breast Cancer
Book by Judy C. Kneece

I would highly recommend getting it to answer questions and guide your decisions.

Hope this helps.