Certainly, the risks in RAF FJ flying during the 70's and 80's were considerable and will have made the average life expectancy pretty dismal. In the late 80's, I roughly calculated that the average RAF FJ squadron had been losing one Cat5 every 3 years and, half of those accidents involved crew deaths.
Also, I don't take much notice of the quoted survival rates. I personally knew quite a few mates who died in-service of medical conditions. One stat that I do not see is the survival stats of full flying career aircrew, not greasy pole types, the NCO Aircrew and Officers who hold operational flying appointments till age 55+.
OAP