待我长发及腰少年已不见
[dài wŏ zhăng fā jí yāo shăo nián yĭ bù jiàn]
The phrase conveys the sentiment that as one grows older and waits (often implying maturation through growing out long hair), the beloved from youthful days is no longer around to share in this moment. It reflects on themes of passing time and lost love. 'Long hair' signifies maturity while the 'younger man' indicates someone who once had a special significance but is now absent, likely referring to missed chances or changes over time.