What's the life expectancy after a double lung transplant?

Can vary: It depends on the age of the donor and recipient, as well as the cause of lung failure. About 55% of lung transplants are working at 5 years.

Multiple factors: It is a complex question, since survival varies depending on a number of factors, including infection and rejection episodes. One year survival is usually 90% at most centers.

Median is 5.5 yrs: That being said, population statistics can't be applied to individuals. How well the surgery went, the match characteristics, how well oh avoid infection, your fitness prior to transplant, how well you tolerate the transplant regimen, etc all effect your quality of life and longevity.

Agree, remain hopefu: As stated by the first answer always reason to hope. I have a patient working full time who is 10 years out and still going strong. Not always easy with recurrent and chronic viral infections but she has been doing great to remain hopeful.