Lack of Consideration. 1  Past consideration is not valid. Something that is already done is done, and it does not change the legal position of the promisor. 2  Preexisting duty does not count as consideration. 3  An illusory promise, or one which the promisor actually has no obligation to keep, does not count as consideration. The promise must be real and unconditional. This doctrine rarely invalidates contracts; it is a fundamental doctrine in contract law that courts should try to enforce contracts whenever possible.
In parts of the world with more conservative social traditions, the average would be considerably higher. i had mine when I was 13 but idk if thats the average age. I would the average age would be from 12 to 15. I had mine when 13, so I would say that is around the average age, but that is just speculation.
The average age of American women having their first child reached a record high of 26 years old in 2013, according to the Centers for Disease Control and Prevention's National Vital Statistics Report.