In Fire Emblem, Jeritza's age isn't a direct factor in his character development. He enters the player's army with advanced skills and stats, reflecting his experience. His abilities are further enhanced by his personal skill and the Crest of Lamine. Despite his high HP and Strength growths, his low Dexterity and Resistance leave him susceptible to magic and enemy Gambits. His character growth is evident in his ambition to improve and strengthen.