My mother found that she had breast cancer in her late 80s. She was a healthy active senior citizen. I do not know the details of her cancer but I do know that she was offered/recommended chemo. She opted for a lumpoctomy and radiation. She refused to go through the rigors of chemo at her age. She passed away at the age of 95 of natural causes. She’s saw no need to be sick and having to endure the effects from chemo treatment at her advanced age. Her cancer did not return.