I second Bailie. I had SCT a year ago at age 73. I am 100% engrafted with my sisters stem cells and they are feisty. Complications are common such as GVHD, c.diff, and CMV. I lived through all of it. I was probably removed from the transplant drugs too soon. Right now I am suffering from moderate GVHD of the eyes, mouth, and skin. They are working to try to fix it up. Without the the SCT I would not be writing this. If in passable health a SCT at 70 should not be a problem. I would do it again in a heart beat. Some of my saga has been posted here. Depending on severity 3 year survival rates are in the 40 to 60% range. In my case this beats 0% without.
If you are looking for more exact odds go to
http://bloodcell.transplant.hrsa.gov.../survival.aspx
Ray