What difference does that make? Even if the OP had owned the car from new he still would not know the state of wear and the serviceability of the engine components.
The whole argument about when to change a cambelt says that if you want to examine a used belt (which will really only tell you if it is likely to fall apart quite soon) you may as well change it anyway after removing enough parts to see it properly.
When Pug switched from chains to belts about 1987 (from the X series to the T series) they had no real idea how long a belt would last, and recommended no change interval. After a few years dealers were advised to change belts at the 48K service; my daughter had that service from a Pug dealer and the belt failed soon after - they hadn't advised her to change. Replacement engine - £550.
In the end the recommendation evolves from the frequency of failures, how much disgruntlement the makers can tolerate, and the willingness of owners to cough up to avoid trouble.
As for the commonsense bit, where do you buy that?
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