该玩的年纪却失了心
[gāi wán de nián jì què shī le xīn]
Translation as 'At the age when I should be enjoying myself, my heart was lost' suggests unrequited love or profound disappointment at a young age. It points out someone who experienced heartache or loss of innocence while they should've been carefree, possibly lamenting misplaced focus during youth, which could be seen in various narratives from romantic mishaps to personal struggles.