sprightly

This term conveys a sense of lightness and agility, often evoking the image of a spirit or sprite. It is most frequently used to describe elderly people who maintain a youthful energy, creating a contrast between their chronological age and their physical vitality. While similar to lively, it specifically emphasizes a brisk, nimble quality of movement or a cheerful, spirited disposition. It carries a consistently positive connotation, suggesting health and an optimistic spirit.