不恋爱的少年枉骚年
[bù liàn ài de shăo nián wăng sāo nián]
It translates to: 'A young lad not in love is just wasting his youth'. It expresses that not being in a relationship during one’s youthful years would be considered as missing out, which is a typical perspective on romance and relationships among teenagers and college students in some circles.