待自己长发及腰少年已走远
[dài zì jĭ zhăng fā jí yāo shăo nián yĭ zŏu yuăn]
Expressing lost youth and unfulfilled longing, it roughly means 'By the time my hair reaches down to my waist, the young lad I once loved would have already moved on'—connoting regret over missed opportunity.