Now when you get to thirteen
You'll get a lot to try
Like Mom's patience, for instance
When you want to change your hair with dye
And practicing and practicing
To ask your parents for the car
When you know all along
You won't get very far
You can try getting an allowance
Or if you have one, get it raised
Of course when you tell them
They'll let you buy groceries too, to get you dazed
You can try living on all sorts of things
Like potato chips and soda pop
But Mom will give you soup, you know
So eat it while it's hot
Thirteen's when you tell Mom
That she's got things all wrong
That she buys the "out" clothes
When she's been doing it all along
Thirteen is listening to the radio
It's not loud, it's just Mom says "Why! Eeee!"
Don't think she's gone mad - it's just a stage
She's sure they can hear music in Hawaii
Thirteen's the time when you get to boss
Little brothers and sisters around
And when you need more privacy
And your comb's in your hand all the time
When the world seems to be
Your opposition
Being thirteen
Is sometimes a bad position
But never ever fear
It will always be clear
That parents have the worst
Of that thirteen year
thirteen

Follow up:
Yes! I did write this when I turned thirteen. I thought people would immediately start treating me like an adult. Boy, was I wrong!