Shift work and ill health

Sometimes I can be working untill 2am , the next week I can be starting work at 5am , with only 28 hours to adjust . Its hell , I write off the first early shift , knowing I will only get a few hours sleep . It gradually gets easier for me and my broken body throughout the week , only for the shifts to change again at the end . I find it very difficult , and im only 25 , how does someone in thier late 50s early 60s cope? Are there any facts that say shiftworkers suffer ill health as a result of what they do? How long does the average shift worker live after retirement? My bet is that a 9 to 5er has a much longer , healthier retirement .