This module describes the data elements related to the diagnosis combining elements from the groups 'Disease history'. It specifically covers the CDE elements 5.1.'Age at onset'. These elements, defined by the JRC, can be found on the EU RD Platform at this link.
You can check an exemplar RDF-based representation for this Common data Element here
If you're interested in implmenting this model on data, you can information around data requirements at our Github implementation repo: