How long is a piece of string?
I was in a similar position before. My car had the belts done 5 years ago but the car had only done 40,000 miles. In the end I changed it because my dephaser was rattly as well. The other reason is that with this car being my daily I did not wish to take any chances. From what I can tell my Clio received its first cambelt change when it was 7 years old with 30k on the clock.
However, I have seen people with belts on well over the 5 year period including a friend's 172 which has been on the car for 5.5 years. I know a couple have been on the car for almost a decade but it is almost a miracle that nothing broke ; the tensioners were almost falling to bits!
It is not something anyone can say to do. After all, it's not our car if the belt lasts or breaks :wink:.