凉了时光老了少年冷了心
[liáng le shí guāng lăo le shăo nián lĕng le xīn]
This poetic expression refers to the feeling of disappointment and sadness as time passes by. ‘Cooling time’ implies a wistful passage of time, 'aging youth,' and 'a cold heart.' It evokes a somber reflection on aging and unfulfilled dreams.