好笑的年少轻狂可悲的白头到老
[hăo xiào de nián shăo qīng kuáng kĕ bēi de bái tóu dào lăo]
It juxtaposes the ridiculous arrogance of youth ('good laughable youthful pride') with a tragic life that ends in old age ('pitifully turning gray'). It carries a strong nostalgic and sad tone about aging and the passage of time.