About 6% of the boys reported having a girlfriend that much older than they.
"One in 10 males and females who reported no relationship in seventh grade said that they had had sex in the 12 months before the ninth-grade interview, compared with at least one in five who reported in seventh grade having had a same-age or older girlfriend or boyfriend," write Marin and colleagues.
The survey didn't ask students to identify their sexual partner or that partner's age.
When there was an age difference, girls were more likely to be the younger person.
Eighteen percent of girls reported having had a boyfriend at least two years older than they were.
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