The cambelt age or replacement period depends on the vehicle model, the brand of the belt, and how much you drive the vehicle. That's why there is no specific time frame when to replace it. However, you should replace it more than once over the course of the car service life. Maximum manufacturers suggest to replace the camblet after a set number of miles or years. Maximum manufacturers suggest to replace the timing belt anywhere between 39,000 and 100,002 miles or 4+ years.