ACS race/ethnicity and age vars for block groups

Hello,

I am trying to know if anyone has been able to pick out age and race/ethnicity variables at the same time for block groups in any given state. I am trying to do an analysis of aging children (children under 18 who will be turning 18 in the near future) but I am trying to look at children of color in particular (black, latino, asian, native american, etc.). Can both be observed at the same time at the block group level, or do I have to pick only one?