Board Thread:Character Discussion/@comment-26062156-20150131174600/@comment-25355646-20150131193914

She is 20.

My explanation: She is 18 in Frozen when Elsa is made queen and the that takes place 3 years after the parents died. The events in OUaT are 2 years after the events of Frozen (the caption at the beginning of 4x01 says 5 years later)