We did the hoses on our Mystique (all 10 of them

, what was Ford thinking

) at 5 years. I was in the shop when they took the lower rad hose off and although it looked and felt fine from the outside, the build-up of slime/sludge on the inside was amazing. Must have reduced the effective cross section by 20-30%. So I was glad we did it when we did.
And yes, it had the coolant changed every 2 years, must be something to do with the water here

So now I am thinking the Pathfinder should get done, and see what it looks like.