It's not more than 10 years, probably like 7/8 years difference. Emel began his training as a knight very young and quickly advanced to become the leader of his troupe. He was 16/17 at the start of the story and she was like 10/11 somewhere around there. Forgive me I can't remember the exact ages or the chapter but its one of the earlier ones after she chooses Emel to protect her.
Ok. That's not as bad. Still weird, but not as bad. Part of it's like, imagine falling in love with someone you used to babysit as an 18 year old. But on the other hand, a 7 year age difference as a adults isn't bad. Plus, age differences and relationship standards in Nobility/Royalty times were much different.

Isn’t Emel like 20 years older than her??? I still feel conflicted about shipping them