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).
Mexicans (Spanish: Mexicanos) are the people of the United Mexican States, a multiethnic country in North America. Mexicans can also be those who identify with the Mexican cultural or national identity. The Mexica founded Mexico-Tenochtitlan in 1325 as an altepetl (city-state) located on an island in Lake Texcoco, in the Valley of Mexico. It became the capital of the expanding Mexica Empire in the 15th century, until captured by the Spanish in 1521.