Mexico requires that the child live with the prospective adoptive parents for a 1-3 week trial period. This must be completed in Mexico. With the combination of the trial period and the required paperwork, most applicants should expect to spend around 3 months in Mexico. It is required that potential adoptive parents be 25 years or older and at least 17 years older than the child. If it is a joint application, for a married couple, only one of the applicants must meet these requirements. The average time frame for Mexico adoptions is around 3-8 months. But that number can vary. There were 22 finalized adoptions in 2011.