PEOPLE change? DO THEY!

I was thinking in the morning and I thought that the thought would have wondered off but it did not. The thought was 'people DO really change.'(I know you may think I am dumb) Have you ever thought that when you say "you've changed" to a person is because you think that the person is different, but actually that person have not changed literally. But change his/her attitude towards you?? I realised that a change is within the mind of maturity.(do I sound witty? /confusing?) Example, GIRLs. During their Primary school days, they will be crazy ALL over some BOYBAND buying their posters, CDs, pictures, queue for an autograph under the HOT sun and etc. (don't ask!) NOW! They just listen to music PLAY "COOL" like oh my why are those girls screaming!!! Or Or Or this may sound familiar to ALL "Don't friend you already la! " but eventually you'll patch all things up having "friendship bands" friendship keyrings, etc. . . NOW! Oh my that girl copied me in buying the same thing I bought it first.
RIGHTO- which is more childish? Its just that they change as they grow. The change from BAD to WORSE! -I KNOW..
Now the change is that. "He doesn't message me like before!", he have CHANGED "We use to spend our 24/7 together now she doesn't even care! ", she have CHANGED "why is she so b**chy now? ", she CHANGED!
the most ridiculous.-"she wasn't like that YESTERDAY!"MY WHAT A CHANGE!!

so do people change? whats the defination?
There isn't a definate defination. Its always changing.
change (chnj)
v.-changed, chang·ing, chang·es

v. tr.

1. To cause to be different: change the spelling of a word.
   
2. To give a completely different form or appearance to; transform: changed the yard into a garden.
   
3. To give and receive reciprocally; interchange: change places.
   
4. To exchange for or replace with another, usually of the same kind or category: change one's name; a light that changes colors.
   
5. To lay aside, abandon, or leave for another; switch: change methods; change sides.
   
6. To transfer from (one conveyance) to another: change planes.
   
7. To give or receive the equivalent of (money) in lower denominations or in foreign currency.
   
8. To put a fresh covering on: change a bed; change the baby.

v. intr.

1. To become different or undergo alteration: He changed as he matured.
   
2. To undergo transformation or transition: The music changed to a slow waltz.
   
3. To go from one phase to another, as the moon or the seasons.
   
4. To make an exchange: If you prefer this seat, I'll change with you.
   
5. To transfer from one conveyance to another: She changed in Chicago on her way to the coast.
   
6. To put on other clothing: We changed for dinner.
   
7. To become deeper in tone: His voice began to change at age 13.

n.

1. The act, process, or result of altering or modifying: a change in facial expression.
   
2. The replacing of one thing for another; substitution: a change of atmosphere; a change of ownership.
   
3. A transformation or transition from one state, condition, or phase to another: the change of seasons.
   
4. Something different; variety: ate early for a change.
   
5. A different or fresh set of clothing.
   
6. Money of smaller denomination given or received in exchange for money of higher denomination.
   
7. The balance of money returned when an amount given is more than what is due.
   Coins: had change jingling in his pocket.
   

Music.

1. A pattern or order in which bells are rung.
   
2. In jazz, a change of harmony; a modulation.
   
3. A market or exchange where business is transacted.