我们年少轻狂不怕岁月漫长
[wŏ men nián shăo qīng kuáng bù pà suì yuè màn zhăng]
Translating as 'We Are Young, Rash and Fear No Long Years Ahead', this conveys youthful recklessness combined with an optimism or bravado regarding the challenges that time or life changes may bring. This can suggest fearlessness or disregard for consequences at a young age.