Answer:
America, referring to the United States, was officially 234 years old on July 4, 2010. If one dates from the adoption of the Constitution in 1787, the nation was 223 years old.
The first explorations of the US mainland area by Europeans were by Spaniards in the early 16th Century. Native Indian tribes had lived in North America for about 25,000 years.
(The landmass that became North America was formed at the same time as the other modern continents, and has drifted in and out of contact with them over millions of years.)