hello, i would like an indication of the life expectancy of a man in his 50 s who has been struggling with two nasty auto immune disorders for at least 10 years. He has a stent and has had a kidney transplant. He repentantly told me his heart was functioning at 20% and he can not walk. He said there is a time frame. this man is the father of my 8 year old boy, so an answer is important. Thank you