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?

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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?