Definition
This idiom is used to emphasize that time passes continuously and cannot be stopped, therefore one should act promptly and not delay.
岁月不待人；时不我待
We need to start this project right away; time and tide wait for no man.
我们需要马上开始这个项目；岁月不待人。
Stop procrastinating, time and tide wait for no man, we need to make a decision now.
不要再拖延了，岁月不待人，我们现在就需要做出决定。
Since the opportunity has arisen, seize it, because time and tide wait for no man.
既然机会已经出现，就抓住它，因为岁月不待人。