The following are some four-word idioms about "youth": 1. Regretless Youth: It means that you cherish your youth without regret. 2. Youth: It refers to the time when one is in the prime of their youth. 3. Youth: It was used to describe the time when one was young and full of imagination. 4. Eternal Youth: It means that you hope that your youth will last forever. 5. Burning Youth: To describe the burning passion of youth. 6. Passion of Youth: To describe the passionate years of youth. Youth Encouragement: It represents the spirit of fighting for the dream of youth. 8. Youth without regrets: It means that you cherish your youth without regrets and constantly pursue your dreams. 9. Flying Youth: It refers to the youth period, which is full of vitality and confidence. 10 Rippling Youth: It described the emotional ripples of youth, full of romance and poetry.