Mike, all the lines to the rear of the slave cylinder are a maximum of 3 years old with both of the lines that run between the wheel cylinders on the rear end being less than a year.
The rubber lines up front were swapped two years ago as claimed by the previous owner. They are in excellent condition.
I'll be driving my 2 and 4 year old boys around in the truck, so I'm as anal about the braking system as anyone would be.
I do appreciate you looking out though. It is sound advice!
Brian