No personal experience. I have followed a young mother's blog who had volunteer double mastectomy. I going to guess her age is about late 20's. She opted for a rebuild and this poor girl has encountered infection after infection in her body since September of last year. She has been in and out of several different hospitals and had several different surgeons. Months after the initial surgery, she finally announced she was having the nipples removed because that could be the source of cancer cells. She tried not to have it done, but finally decided she needed to do it.
For the amount of pain this poor girl encountered to try to keep what we know as feminine, I don't think it is worth it. If your mother is 63 and knows first hand what she is talking about, let her make her own decision.
I work the SGK Race for the Cure of Southern Nevada every year. There are several woman who elected the removal only and appear to be perfectly happy with it.