what is the age range with the highest percentage of premarital sex in the USA?

 According to the search results, the age range with the highest percentage of premarital sex in the USA is between the late teenage years and early adulthood. Data from the National Survey of Family Growth indicate that in 2002, 77% of Americans had sex by age 20, and of that percent, 75% had premarital sex

1

2

. A study published in Public Health Reports found that by age 44, 99% of respondents had had sex, and 95% had done so before marriage

3

4

. Additionally, a report from the CDC shows that the age at which women have their first premarital sexual intercourse has been decreasing since the 1970s, with the majority of women having sex before age 20

5

. Therefore, it is safe to say that the age range with the highest percentage of premarital sex in the USA is between the late teenage years and early adulthood.