Time and tide wait for no man.
岁月不待人
Time cannot be won again.
时间一去不再来
Time is, time was, and time is past.
现在有时间，过去有时间，时间一去不复返
Time lost can not be recalled.
光阴一去不复返
Time flies like an arrow, and time lost never returns.
光阴似箭，一去不返
Time undermines us.
光阴暗中催人才。或莫说年纪小人生容易老