What is generally the upper age limit for receiving an allogeneic stem cell transplant?

What is generally the upper age limit for receiving an allogeneic stem cell transplant?
Why do patients relapse after transplant?

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How do patients find a matching donor?
What is graft versus host disease or GVHD?
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Why do many patients not receive a transplant?
What is the role of a caregiver in the transplant setting?
When should AML patients start the donor match process?