Youthful | Mean of youthful in English Dictionary

/ˈjuːθfəl/

• having or showing the freshness or energy of someone who is young
1. youthful good looks
2. He's a youthful 50-year-old.
3. My grandparents are still very youthful.
• having or showing the innocence, hope, lack of knowledge, etc., of someone who is young
1. youthful optimism
2. youthful inexperience