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).
Mexico is an ethnically diverse nation, and the Mexican constitution defines the country to be multicultural. Most Mexicans are Mestizos, people of mixed European (White) and Native American background. They account for 60-80% of the Mexican population (between 67 up to 90 million in 2010).