该玩的年纪动了心该疯的年纪动了情
[gāi wán de nián jì dòng le xīn gāi fēng de nián jì dòng le qíng]
Describes missing out on carefree years due to feelings: 'At the age meant for play, fell in love; at the time for madness, fell in emotion.' This captures the complexity when young hearts experience early loves and emotions, changing their path from youthful freedom towards more mature considerations