Youthful

прилагательное 1) молодой, юный Например: youthful appearance — моложавость Синоним(ы): young 2) юношеский Синоним(ы): juvenile 3) новый; недавний, новейший, ранний Синоним(ы): new, novel 4) активный, деятельный, живой, энергичный Синоним(ы): energetic, vigorous

Большой англо-русский словарь

Youthful

adjective 1. of, relating to, or characteristic of youth Example: youthful inexperience 2. being young and not yet mature 3. marked by or possessing youth Example: youthful dancers 4. having the vitality or freshness of youth; vigorous Example: my youthful grandparents 5. having accomplished or undergone little erosion Example: youthful mountainsyouthfully adverbyouthfulness noun

Merriam-Webster's Collegiate Dictionary