NCIC Missing Person and Unidentified Person Statistics for 2008
" The National Crime Information Center’s (NCIC’s) Missing Person File was implemented in 1975. Records in the Missing Person File are retained indefinitely, until the individual is located or the record is canceled by the entering agency. The Missing Person File contains records for missing who:

* have a proven physical or mental disability (Disability—EMD);
* are missing under circumstances indicating that they may be in physical danger (Endangered—EME);
* are missing after a catastrophe (Catastrophe Victim—EMV);
* are missing under circumstances indicating their disappearance may not have been voluntary (Involuntary—EMI);
* are under the age of 21 and do not meet the above criteria (Juvenile—EMJ); or
* are 21 and older and do not meet any of the above criteria but for whom there is a reasonable concern for their safety (Other—EMO).

As of December 31, 2008, there were 102,764 active missing person records in NCIC. Juveniles under the age of 18 account for 51,054 (49.7 percent) of the records and 12,648 (12.3 percent) were for juveniles between the ages of 18 and 20.*"