年少不多情不算少年
[nián shăo bù duō qíng bù suàn shăo nián]
The meaning here could be paraphrased as 'If youth isn't full of love, then it's not really youth' expressing the idea that a passionate youthful phase with romantic involvement is part of what defines young adulthood as rich and colorful, implying regret or nostalgia for lost years filled with infatuations and ardor that make up a typical youthful period.