1. in a manner characteristic of youth; with the energy, appearance, or spirit of a young person

Examples

• She smiled youthfully despite being in her seventies.
• He bounded youthfully up the stairs two at a time.
• The grandmother danced youthfully at her granddaughter’s wedding.
• She approached each new challenge youthfully with enthusiasm.
• His eyes sparkled youthfully when he talked about his hobbies.
• The actor moved youthfully across the stage despite his age.