Simplify the following text for a Grade 10 native English-speaking person.
Original: In Norse mythology , the goddess IÃ unn is portrayed in the Prose Edda ( written in the 13th century by Snorri Sturluson ) as providing apples to the gods that give them eternal youthfulness .
Simplified: In Norse mythology , the goddess IÃ unn gives apples to the gods in Prose Edda ( written in the 13th century by Snorri Sturluson ) that makes them young forever .