Email this page Printer-friendly version Share with Prime Time Bliss is racing in western Canada at the age of 15 -- where it is still legal for him to do so. Of the following, what do you think should be the mandatory retirement age for Standardbred racehorses? Choices 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * I don't think there should be a mandatory retirement age *