Youth crime continues to plummet across the country, with arrests of people under age 18 falling for the 13th straight year and reaching lows not seen in at least six decades, new FBI figures show. The number of juveniles arrested nationwide declined 11% from 2017 to 2018 alone, compared to a 2% drop for adults. Arrests of young people for violent crimes - rape, robbery, assault and murder - fell 5%, while they actually increased slightly for those 18 and older. The 2018 arrest rate among juveniles - 21.3 per 1,000 youths - is half of what it was in the 1960s and less than one-quarter of what it was in the mid-1990s, at the peak of a youth crime spike, according to an analysis of the FBI data provided to The Chronicle by the Center on Juvenile and Criminal Justice in San Francisco. "It's not just historic lows, it's a historic chasm," said Mike Males, a senior research fellow with the center. "It's not even leveling out." The data show that the trend of juveniles committing less crime has crept up into young adults, with arrests among those 18 to 24 also declining significantly in recent years. The changes could have profound implications on communities and the criminal justice system in years ahead. "That may be the result of the low-crime juvenile generation aging into their 20s," Males said. "Hopefully this generation is beginning to impact older generations." The plunge in teen crime extended to urban, suburban and rural counties, according to the FBI statistics.