少年未老心已荒凉
[shăo nián wèi lăo xīn yĭ huāng liáng]
'Youth Unaging but Heart Already Desolate' conveys the feeling of a prematurely worn-out psyche despite still being young in age. This suggests experiences that have led to cynicism or disillusionment early on, perhaps due to difficult circumstances or emotional turmoil.