Tommy Thompson, single, lived and breathed the air force. He retired from RAF Marham as a Sqn Ldr Spec Aircrew aged 55 and was dead the next week.
OTOH he is the only early death that I know of. Get some outside interests is the best advice. Also remember that YOU owe the service nothing after the age of 38. From that age they take your pension off your pay and pay you less and less as the years go on.
For instance you might earn £40K at age 37 and again at 38 etc but from age 38 you would have had a pension of say £12K so your real pay is now only 28K. By the time you are 55 your real pay has dropped to say £18K. Sobering thought eh! This is based on the fact that you could have earned the £40K with BAE or some such and drawn your pension.