WASHINGTON - Nearly 1.5 million babies, a record, were born to unmarried women in the United States last year, the government reported Friday. And it isn't just teenagers any more. ADVERTISEMENT [0] "People have the impression that teens and unmarried mothers are synonymous," said Stephanie Ventura of the National Center for Health Statistics. But last year teens accounted for just 24 percent of unwed births, down from 50 percent in 1970, she commented. The increases in unmarried births have been among women in their 20s, she said, particularly those 25 to 29.