蓝鲸少年依旧蓝时光少女依旧美
[lán jīng shăo nián yī jiù lán shí guāng shăo nǚ yī jiù mĕi]
In this name, 'the boy blue whale remains as blue as the girl time retains her youth and beauty'. This implies an everlasting youth and charm both the characters maintain despite the changing times