In the Social Value Bank we have a number of values that fall under a "Youth" heading. The youth variables in the SVB were calculated using the British Household Panel Survey youth sample. The BHPS youth dataset includes all children aged 11 - 15 years on or before December 1st of the survey year living in a household with at least one Permanent Sample Member (PSM) are eligible for interview. The sample size ranges between 700 and 1414.
Details available on p25 of the guidance document: https://www.iser.essex.ac.uk/files/bhps/quality-profiles/BHPS-QP-01-03-06-v2.pdf