Why change is the only constant?

I am thinking on this from past few days!... ( or was it months?)

How the change is a constant? that was my first thought.
Then i realized life is full of changes... u are born baby... then youth... then mid age...
Yes it seems i have seen a lot from my childhood.
the requirements in childhood would be more of play and study... being first in class or sports! having a cricket match on weekend would be an event which can't be missed out at any cost.

Then comes the Youth...
u would dream of something...having a big car, big Job, perfect companion! great friend circle...
Missing out a party would be a big mistake in this age...

so u have a job , have a great car to drive.... and of course perfect companion.
then what ? r u finished? nope it goes on... to lengths and lengths...

Along with all your personal experiance.... all around you change... the environment changes... the constructions changes... global warmin happens... YES! everything changes.

Oh! i got it... may be its that the change can't be changed! is that y change is the only constant?

well these are few of my thoughts.