youthful

adj.

年轻的，有朝气的；青年的；早期的；年轻气盛的

1. No one can remain youthful forever.
   没有人能永保青春。
2. His youthful escapades came back to haunt him.
   年轻时的胡作非为时常令他感到苦恼。
3. He was youthful but white-haired.
   他虽已白发苍苍,却仍然朝气蓬勃。
4. If you want to retain youthful vigor,you have to take regular exercise.
   如果你想保持青春活力，你就得经常锻炼。
5. He was full of youthful idealism.
   他满脑子都是年轻人的理想主义。
6. He was full of youthful curiosity.
   他充满了年轻人的好奇。

The youthful cheek and the deep medial fat compartment.
CHILD MALTREATMENT AND YOUTHFUL PROBLEM BEHAVIOR
Problem‐solving thinking of youthful incarcerated heroin addicts
Martian Seeps and their Relation to Youthful Geothermal Activity
Pathological gambling among youthful multiple substance abusers in a therapeutic community.
Variation in youthful risks of progression from alcohol and tobacco to marijuana and to hard drugs across generations
The current age of youthful melancholia. Evidence for increase in depression among adolescents and young adults.
Theorising Urban Playscapes: Producing, Regulating and Consuming Youthful Nightlife City Spaces
Taking risky opportunities in youthful content creation: teenagers' use of social networking sites for intimacy, privacy and self-ex...
Daily Melatonin Administration at Middle Age Suppresses Male Rate Visceral Fat, Plasma Leptin, and Plasma Insulin to Youthful Levels