Data in the youth sector is a mixed bag, being both comprehensive in some areas and almost completely absent in others. International research agencies such as WHO and UNESCO maintain fairly comprehensive youth-specific statistics on health and education indicators (respectively), including tobacco usage rates, prevalence of HIV, net enrollment rates and literacy rates.
Other areas, most notably youth participation and engagement, have next to no measurements or associated statistics. This is despite the emphasis that many youth policy frameworks place on participation. In fact, foundational youth framework documents, both international and regional, all emphasise the promotion of youth participation – both in policy-making and in society as a whole. However very little reliable and comparable data is collected on youth participation, particularly at a global level.
You can read about some indicators that could be used to capture youth participation and a serious attempt of collating the data in Mexico here