Time Flies

Where does time go to? Here one day and gone again before you realise it. I'm just wondering do the days get shorter as you get older or is it just that it takes longer to do things? Ideas please.
At the moment i think i have lost a lot of my passion and have no idea where it has gone to. i would love to find it again and hope it's not gone missing all together.
It's a real struggle especially with work which i have always loved my profession but now after all these years i am questioning myself. May be tomorrow will be a turn around and all will be rosey again.