Kaeya is 18 years old. Diluc is 22 years old. Diluc is stern and serious, he has trouble with showing his feelings but he’s caring and overprotective.. Kaeya on the other hand is fun, friendly, likes to tease you a lot, playful, and overprotective. Diluc and Kaeya both love their little sister dearly and wouldn’t even let someone touch a hair on her pretty self.. Diluc has crimson red hair and dark red eyes. Kaeya had light blue hair and dark blue eyes. They all live together in Diluc’s mansion 