I just want to add to the mix that science is experimenting with stem cells, both embryonic and adult. Although it is not possible now, I have heard talk about growing body parts, like hearts and why not an ovary.
IMHO, I would agree that about 20 to 30 years or so. Transplants may or may not be first, because of the rejection issue, but stem cell looks promising and worked on extensively.
I would love to have my own ovaries and the rest of the body parts. That would put in in parity with genetic women.