Most people in the United States have sex for the first time around age 17. The mean age is 17.0 for men and 17.3 for women, based on CDC survey data. But that single number hides a wide range of experiences, shaped by where you live, your generation, and personal circumstances.
Average Age of First Sex in the U.S.
The CDC’s National Survey of Family Growth, which tracks sexual and reproductive health across the country, puts the mean age of first intercourse at 17.0 years for men and 17.3 years for women. These figures come from adults aged 15 to 44 surveyed between 2011 and 2015, and they reflect penile-vaginal intercourse specifically. Most research on “sexual debut” uses this same narrow definition, which means oral sex, manual contact, and other sexual experiences aren’t captured in the headline number.
That distinction matters. Many people experience some form of sexual contact before intercourse, so the age at which someone first considers themselves sexually active may be younger than these statistics suggest. Researchers have acknowledged this limitation, noting that survey questions often leave the meaning of “sex” open to interpretation by the people answering them.
How the U.S. Compares to Other Countries
A large international survey conducted by Durex across 44 countries between 2005 and 2009 found significant variation worldwide. The U.S. average of around 17.8 years in that survey was similar to Australia, New Zealand, Turkey, and Slovakia. Nordic countries like Finland, Norway, Sweden, and Denmark reported notably younger ages, all at 16.5 years or below. On the other end, people in Malaysia, India, Singapore, and China reported first having sex at age 22 or older.
Cultural norms, religious values, access to sex education, and legal frameworks all play into these differences. Countries with comprehensive sex education and more open attitudes toward adolescent sexuality don’t necessarily see younger sexual debut ages, but the conversation around it tends to emphasize safety rather than abstinence.
Teens Today Are Waiting Longer
One of the clearest trends in recent decades is that fewer teenagers are having sex compared to previous generations. CDC data shows that the percentage of teenagers aged 15 to 19 who had ever had intercourse declined steadily between 1988 and 2017. Among male teenagers specifically, the share who had ever had sex dropped from 46% in 2002 to 38% in 2015 to 2017. For female teenagers, the rate held relatively steady at around 42% over that same period.
This trend extends into early adulthood. Among 20- to 24-year-olds, more than twice as many millennials born in the 1990s (15%) reported having no sexual partners since age 18, compared to just 6% of Gen X members born in the 1960s. The rise in sexual inactivity among young adults has been one of the more discussed findings in recent sex research, and it appears to be continuing with younger cohorts.
What’s Behind the Delay
Researchers point to several overlapping factors. Parent communication stands out consistently. Studies on rural middle school students found that teens who talked with their parents about sex and relationships were more likely to delay sexual activity. Building what researchers call “sexual agency,” the confidence and skill to say no or set boundaries, was also strongly linked to both never having had sex and intending to wait longer.
Beyond family dynamics, broader social shifts play a role. Young people today spend more time on screens and social media, which may reduce in-person social opportunities. Economic pressures like student debt and delayed milestones (moving out, starting careers) can also push intimate relationships to a later stage. The overall pattern isn’t that young people are uninterested in sex. It’s that the social and economic landscape has shifted in ways that make early sexual experiences less common than they were a generation ago.
Sexual Activity Through Adulthood
Sexual frequency peaks in the mid-20s to mid-40s. A 2020 survey found that about 50% of men and 54% of women aged 25 to 34 reported having sex at least once per week. Those numbers stayed roughly the same for the 35 to 44 age group, with about 50% of men and 53% of women maintaining a weekly frequency. For the youngest adults (18 to 24), the weekly rate was actually lower: 37% of men and 52% of women.
That lower rate among the youngest adults may seem surprising, but it aligns with the broader trend of delayed sexual milestones. Many 18- to 24-year-olds are still navigating first relationships or haven’t yet started having sex at all.
Sex After 60
Sexual activity doesn’t stop at any particular age, though it does become less common. Research shows that roughly half of adults aged 60 to 69 remain sexually active. Among women specifically, about 52% of those aged 60 to 69 reported being sexually active, dropping to about 33% for women aged 70 to 79, and 14% for women aged 80 to 89. For the 70 to 79 age group overall, about one in five people reported ongoing sexual activity.
Health conditions, medication side effects, the availability of a partner, and changes in desire all influence sexual activity in later life. But the data makes clear that sex in your 60s, 70s, and beyond is common enough to be considered a normal part of aging rather than an exception.