Regarding evolution we are probably more geared towards surviving external threats than we are towards surviving internal organ failures by old age and a sedentary lifestyle.
Right, almost certainly. Partially because in the big picture, that's the bigger threat. Not in this particular moment in time, although in parts of the world that remains true. But to get to where we are, we have to be geared towards overall survival and can't change the design quickly when the situation suddenly changes.