The survey looked at 8.3 million teenagers between 19.Over time, teens have become less interested in taking jobs, going on dates, or driving.Although such laws have had a long history in the United States, they had fallen into disuse in the last few decades, and only recently have some states revived and expanded these laws as part of efforts to reduce teenage pregnancy and related public welfare costs.
Among mothers aged 15-17 who had a child in 1988, 27% had a partner at least five years older than themselves.
In addition, since 23% of minors with older partners were married at the time of the infant's birth, 21% of babies born to unmarried minors were fathered by substantially older men.
While a 25-year-old man fathering a child with a 15-year-old would probably meet with social disapproval, the same might not be true for a couple consisting of a 21-year-old and an 18-year-old, particularly if they were married.
Second, many relationships between men 20 or older and women 19 or younger do not violate any state's law, provided there is no forcible rape or incest.
Twenge notes that when teens do get together, they tend to relentlessly document those hangouts on social media using one thing that’s on the rise: smartphones.