A guy i work with has a 04 182 with 23k miles on and his is just about the become 5 years old, he's not had the aux or cambelt done yet and isn't going to until he's done another 6k miles as that is when Renault have told him his next service is due (he's one of these people who think they're the experts so i'll go by what they say)
It's annoying as i've really tried to explain why it needs to be changed, especially the aux belts. Oh well, i have warned him and we'll wait and see what happens! Fingers crossed the belts will last the duration for him.
I've had the Auxiliary belts and pulleys tensioners done at 3 years 19k miles and i'll be having the cambelt done at 4 years which will be about 30k miles i'd imagine. As has been said, better safe than sorry and there are plenty of local specialists about that offer a full belt change in the region of £4-500