In large surveys, first sexual intercourse most often falls in the late teens, with many people reporting it around ages 17 to 18.
The question sounds simple. The answer isn’t. “Virginity” means different things to different people, so serious surveys usually avoid that word and ask about first sexual intercourse instead. One study may mean vaginal intercourse, another may ask about any sexual contact, and a third may only survey teenagers.
Still, a pattern shows up again and again. The late teens are where the numbers cluster. In U.S. survey data, the average age at first vaginal intercourse lands a little above 17 for women and right around 17 for men. In Britain, survey work has placed the median at 16 among young adults. That does not mean everyone starts at 16 or 17. It means the middle sits in that range, while plenty of people are earlier, later, or not sexually active yet.
If you came here for one usable answer, it’s this: people do not all start at one fixed age, but large surveys usually place first intercourse in the late-teen years.
What Survey Questions Are Really Measuring
Before you pin the whole topic to a single number, it helps to sort out what researchers are asking. Many data sets measure age at first vaginal intercourse. Some ask people to recall the age years later. Some only sample current high school students. Some track adults ages 15 to 44 and ask them to report backward.
Those choices change the result. A teen-only survey will usually make sexual activity look lower than a lifetime survey of adults, since many teens have not had sex yet. A survey of adults can tell you the age they first had sex, but it still depends on memory and wording. That is why two truthful studies can land on slightly different numbers without either one being wrong.
- Mean age tells you the arithmetic average among people counted in that survey measure.
- Median age tells you the midpoint, where half were younger and half were older.
- “By age 19” figures show how many had started by that birthday, not the single most common age.
That is why the label “losing virginity” can muddy the water. The phrase feels blunt and familiar, but researchers need tighter wording.
Average Age People First Have Sex In Large Surveys
The clearest U.S. numbers come from the CDC’s NSFG estimates on age at first sexual intercourse. On that page, the mean age is listed at 17.3 years for women ages 15 to 44 and 17.0 years for men ages 15 to 44 in the 2011–2015 data. That puts the center of the story squarely in the late teens.
The same CDC material also shows how fast the percentages climb through the teen years. By age 15, about 13% of females and 18% of males had had intercourse in the 2011–2013 estimates. By age 17, that rises to 43% of females and 44% of males. By age 19, it reaches 68% of females and 69% of males.
Teen data tell a related, but different, story. The CDC’s 2023 sexual risk behavior summary says 32% of U.S. high school students had ever had sexual intercourse. That figure is lower than lifetime adult estimates because many students are still in the ages before first sex happens.
| Survey finding | Figure | What it tells you |
|---|---|---|
| U.S. women 15–44, mean age at first intercourse | 17.3 years | Late teens sit near the middle of the distribution. |
| U.S. men 15–44, mean age at first intercourse | 17.0 years | The male average also lands in the late teens. |
| U.S. females by age 15 | 13% | Most girls had not had intercourse by 15. |
| U.S. males by age 15 | 18% | Most boys had not had intercourse by 15. |
| U.S. females by age 17 | 43% | The late teens are where the curve starts rising fast. |
| U.S. males by age 17 | 44% | By 17, male and female estimates are close. |
| U.S. females by age 19 | 68% | By the end of the teens, a clear majority had started. |
| U.S. males by age 19 | 69% | The pattern is similar for males. |
| U.S. high school students in 2023 who had ever had sex | 32% | Teen-only surveys show a younger slice of the population. |
| Britain ages 16–24, median age at first intercourse | 16 years | The midpoint in that young adult group sits a bit earlier. |
At What Age Do People Lose Their Virginity? Why One Number Fails
Here’s the snag with one-number answers: they flatten a wide spread of real lives into a neat little headline. Some people start at 15 or 16. Some start at 18 or 19. Some wait far longer. Some never have intercourse at all. A mean or median can tell you where the middle sits, but it cannot tell you what is “normal” for every person.
Country and survey year matter too. In a UCL release tied to Britain’s Natsal work, the median age at first heterosexual intercourse among 16- to 24-year-olds was reported as 16. That is a touch earlier than the U.S. mean ages above, but it is not a contradiction. Different country, different sample, different measure, different result.
The timing also shifts over generations. Older adults grew up under different rules around dating, school leaving, cohabitation, and marriage. Younger people are shaped by a different set of pressures and choices. That is one reason why “the average age” should be read with the survey year attached, not as a timeless truth.
Why Early Teen Claims Get So Much Attention
People tend to remember outliers. A story about someone starting at 13 sticks in the mind far more than a plain survey median. Yet large data sets keep showing that early teen first sex is not the center of the curve. It happens, but it is not where most people fall.
That matters because the public often mixes up “possible” with “usual.” Once you separate those two, the topic gets easier to read.
| Claim you might see | What it usually means | Best way to read it |
|---|---|---|
| “The average age is 17.” | A mean from one survey question and one sample. | Read the country, year, and wording before you treat it as universal. |
| “Only 32% of students had ever had sex.” | A teen-only school survey, not a lifetime adult measure. | Useful for current teens, not for all people. |
| “Most people start at 16.” | Often a median from one age band or one nation. | It marks the midpoint, not a rule everyone follows. |
| “Many lose it by 15.” | A minority share can still sound large in headlines. | Check the actual percentage and compare it with older teen ages. |
| “People are starting younger than ever.” | A trend claim that needs year-by-year data. | Do not trust it unless the source shows the time series. |
What The Numbers Mean For Real People
If you’re asking this out of curiosity, the survey answer is enough: the late teens are the center. If you’re asking because you feel early, late, behind, or out of step, the same data still help. They show a spread, not a deadline. Even by age 19, CDC estimates do not put the share at 100%.
What A Later Start Does Not Mean
A later first time does not place someone outside the normal range. The survey figures themselves show that plenty of people have not had intercourse by the end of the teen years. One average cannot turn that wider spread into a rule.
So if someone asks, “At what age do people lose their virginity?” the clean answer is this: most survey-based answers land in the late teens, often around 17 to 18 in U.S. data, with other countries landing a bit earlier or later based on the sample and wording.
References & Sources
- Centers for Disease Control and Prevention.“NSFG age-at-first-sex data.”Gives U.S. estimates for mean age at first sexual intercourse for women and men.
- Centers for Disease Control and Prevention.“Sexual Risk Behaviors.”Lists 2023 figures on how many U.S. high school students had ever had sexual intercourse.
- University College London.“Survey Examines Changes In Sexual Behaviour And Attitudes In Britain.”Reports the median age at first heterosexual intercourse in Britain’s Natsal data for ages 16 to 24.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.