The demographic fields are currently exposed in Valence only. We're looking at how they may be used in other parts of the system but have not included anything into the core UI just yet. We wanted to make this available to app developers and clients but didn't want them to have to wait for exposure in the UI.
There's some obvious places we may want to expose the fields but also lots places we haven't thought about that are important. We're interested in hearing more about where people would like to see these being used.