The passing of time

How many times have you heard someone say: " how time flies?"
Probably lots of time!
From my point of view the passing of time is quite an usual topic among people because it worries us mainly for ageing or simply it makes us wishful. In addition we know we can't stop time, at least for now, because we haven't created a time machine so...What  can we do? 

On the one hand, we must accept the passing of time is unavoidable and that it is impossible to go back in time, so we have to get the best out of every period of our life.

On the other hand, if we want to forget about the fast passing if time, we should avoid a monotonous life.