Recent surveys indicate that:
About 7 percent of teens say they belong to gangs.
Gang members usually range in age from 12 to 25 years old. The average age is 17.
Many large gangs have members of several age and ethnic groups. Some gangs may have specific ethnic groups, while other gangs contain only white members.
About 20 percent of all teens know someone who was killed or injured by gang members.
In some cities, as many as 70 percent of teens killed by guns are gang members.
Gangs are not a problem just in big cities. They have spread from the cities all the way to small towns and rural areas. Gangs- and the biolence they cause- are problems for everyone across the country.
Source: http://www.hopefs.org/Behavior/TeensandGangs