With the U.S. now accounting for only about a third of all Facebook users, we are starting to see a gradual shift away from its original demographic of college-age users (18-25): 46% of all users are 18-25 years old, down from 51% in late May. The number of users in the 18-25 segment is growing, but at a slower pace than the other age groups. Among the major Facebook age segments, the fastest growing are teens (13-17) and young (26-34) to middle-age (35-44) professionals, with the growth in teens driven by non-U.S. markets. Also note the strong growth in the much smaller 45-54 and 55-59 age groups:
And a breakdown of where all these new users are based out of..