We just learned from “Keeper of the Spire” that Cassandra is 4 years older than Rapunzel. Rapunzel is 19 now so that makes Cassandra *count with my fingers* 23 years old. Now let's bring Varian in.

How much older is Cassandra than Varian?

Varian and Cassandra's age gap is approximately 6-10 years.

Does Varian have a crush on Cassandra?

Varian is Corona's first Royal Engineer, and is the youngest to hold that position. He has a crush on Cassandra, as shown in "Great Expotations".