I think the Pug 505 GTi came with out any reference to the timing belt. I could be wrong about that, I assume the earlier petrol 505's had chains and there was no mention of the timing belt for them either. I think peugeot settled on 100 thousand klics with no reference to time after some initial queries.
Various marques seem to have different intervals but given that a car is driven often enough the belt would not get a chance to deteriorate from lack of use and total Klm would be the yard stick for when to change, plus some regard to how hard the car is used.
We have absorbed my mothers car (she is 88 and we don't want her driving, V6 front wheel drive) into the family car pool, it is 11 years old and done only 50 thou and I am wondering how long I can put the belt change off for? mechanics say change. I'd like to hang on longer, ignoring age and aim for a Klm based change.