The most common age in the United States is people who are 31 and 32. Births spiked in the 1990s and first decade of this century, peaking around 2007/2008:

Source: A Wealth Of Common Sense
The most common age in the United States is people who are 31 and 32. Births spiked in the 1990s and first decade of this century, peaking around 2007/2008:

Source: A Wealth Of Common Sense