VCs are what a user holds. So generally with age you will be issued a credential that includes your age. However, VCs have the concept of a 'presentation' whic

VCs are what a user holds. So generally with age you will be issued a credential that includes your age. However, VCs have the concept of a 'presentation' which is what you show someone that wishes to verify something about you. The 'just show them the data and the digital signature' approach is one way to do presentations. But depending on the actual digital signature, you can also do presentations based on range proofs. Or general zero knowledge proofs. So the issuer is not using range-proofs. Its the holder who is presenting his credentials that gets to do range proofs. That does depend on the issuer using specific kinds of signatures though.