What is the life expectancy after a double lung transplant if cystic fibrosis?

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.

5 to 10 years: 5 year survival after double lung transplant occurs in 80% of people with cf. 10 year survival occurs in 50% of people with CF who have a double lung transplant and therefore is the average life expectancy. Regular medical care to manage episodes of rejection and infection in the transplanted lungs are critical to achieving a good outcome.