As at 21 January 2008, the National DNA Database (NDNAD) held 362,812 profiles from individuals between the ages of 10 and 18 (up to their 18th birthday), from all forces in the United Kingdom, (this includes England, Wales, Scotland, Northern Ireland and the Channel Islands). The number of profiles held on the database is not indicative of the number of individuals. As it is possible for a profile to be loaded onto the NDNAD on more than one occasion, some profiles held on the NDNAD are replicates. This can occur, for example, if the person provided different names, or different versions of their name, on separate arrests.
At present, the replication rate is 13.3 per cent, that is, the number of people whose details are loaded is 13.3 per cent fewer than the number of profiles. Therefore, the estimated number of individuals between the ages of 10 and 18 as at 21 January 2008 is 314,558. Individuals who were under 18 at the time that a DNA sample was taken from them, but were over 18 on this date, are not included in the figures.
The IDENT1 database, which holds fingerprints records, cannot provide information on the ages of individuals.