The CASRAI-UK community has identified a number of issues related to the lack of an accurate and consistent way to classify researchers and scholars by the stage they are at in their career. There is fragmentation in this level of information - across research institutions, research funders, disciplines and countries. In short, how does the community denote ‘research age’? This classification is needed in multiple stages of research information collection: eligibility for funding opportunities, Athena Swan and the Race and Equality Charter Mark. This activity will look at what definitions are currently in place in the UK context to start (REF, ECR, HESA categories, etc.) and what commonalities exist across these contexts them? The output will be a first-draft standard agreed taxonomy.