Final answer:
The available information does not provide data about the average age of entry of sex workers in Canada for Aboriginals.
Step-by-step explanation:
The question asked is regarding the average age of entry of sex workers in Canada for Aboriginals. Unfortunately, there is no specific information provided about the average age of entry of sex workers in Canada for Aboriginals in the given references. The provided information focuses on the mean age of Canadians and Americans entering a certain industry. Therefore, it is not possible to answer the question accurately based on the available information.