A kitten will be considered a cat when it's nine months old. I once read that a cat was adolescent from about 10 to about 18 months of age... I guess that means s/he's an adult past 18 months of age.
Ethnically, Mexican Americans are a diverse population including Mexicans of Indigenous ancestry, Mexicans of European ancestry (mostly Spanish), and Mexicans of Middle Eastern stock (mainly Lebanese).
Middle Eastern Mexicans are the result of such policies; right now this ethnic group makes up to 1% (1.1 million) of the Mexican population. Most  Arab Mexicans  trace their origins to Lebanon, with many other from Iraq, Syria, Egypt, Jordan, and Palestine.