How old were the actors in Winx Club - Il segreto del regno perduto (2007)?

Sixteen years ago the most powerful warrior wizards of the Magic Dimension sacrificed themselves to fight against absolute evil. Now the fate of a kingdom is in the hands of a young girl - Bloom, the fairy of the Dragon's flame. Accompanied by her Winx Club girlfriends, Bloom must overcome the greatest challenge of all: enter the depths of the obscure dimension, fight against evil to bring her parents back to life and reveal the mystery linked to her origins. The destiny of the entire Magic Dimension depends on the outcome of this conflict.