During 1961-2011,birth rates decreased for all women aged 15-44 years. During 2007-2011, birth rates decreased for all women aged less than 40 years, or with rates for women aged 20-24 years (85.3 per 1000 population) and those aged 15-19 years (31.3) reaching historic lows. The birth rate for women aged 25-29 years decreased 9% (to 107.2),the rate for women aged 30-34 years decreased 4% (to 96.5), and the rate for women aged 35-39 years decreased 1% (47.2). The rate for women aged 40-44 years increased 7% (to 10.3).
Source: cdc.gov