作者给底:曾不知老之将至
"不知老之将至"应该是是正确的,请看照片:
http://www.imageshare.cn/web/view/view.php?path=g.%D2%D5%CA%F5/%CA%E9%B7%A8/%C0%BC%CD%A4%BC%AF%D0%F2%28%CD%F5%F4%CB%D6%AE%29&fileid=10&name=11.jpg