I was thinking about the design and age of the engines, mechanical, electrical stuff. You are right, I forgot about the different operating conditions between the services. For the F-14, deck landings, catapult launches and exposure to salt water spray all the time.
5500 hrs, what was their life expectancy? You mention the G models, they got 15, only 7 were in service at any one time, they were not intended as operational aircraft and served only to reduce the flying hours on the C models, which were planned to soldier on till 2020. Last G model was retired in 2007. Nevertheless, job well done for the G model.
I suppose you also refer to the G model on the satefy record. The Australians lost four F-111Cs earlier before upgrading them under their own Avionics Upgrade Program, similar to the AMP.
With all respect the age of the jets, their amazing capabilities, and the 111 community in Australia, I still think the retirement in favor of the Super Hornet / F-35 is the right decision. And as I said before, especially the Super Hornet interim solution is a good decision, and we can expect much from it as we know from the USN experiences and the Block II improvements. Not only will it do a much better job in today's wars, it also fills the fighter gap until the F-35 arrives. Dr. Carlo Kopp is in love with the F-111 and wants F-22s, can't blame him for that, but it's not happening is it.