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).
Mestizos in Mexico. Mestizo Mexicans are Mexican people of mixed descent. Their ancestry is primarily the result of admixture between the indigenous people of Mexico and Europeans, and also, to a lesser extent, Africans and Asians.