In 2008, when the number and rate of births fell in all other age groups, the pregnancy rate for women in their 40s rose about 3 percent (to the highest rate since 1967), and the rate for women age 45 and over rose 4 percent.

http://www.babycenter.com/404_what-are-the-risks-of-having-a-baby-if-im-35-or-older_3127.bc

In 2008, when the number and rate of births fell in all other age groups, the pregnancy rate for women in their 40s rose about 3 percent (to the highest rate since 1967), and the rate for women age 45 and over rose 4 percent.