"Do you realize the only" joke

Do you realize the only time in our lives when we like to get old is when we're kids? If you're less than 10 years old, you're so excited about aging that you think in fractions.
"How old are you?"
"I'm four and a half!"
You're never thirty-six and a half. You're four and a half, going on five! That's the key.You get into your teens, now they can't hold you back.
You jump to the next number, or even a few ahead.
"How old are you?"
"I'm gonna be 16!"
You could be 13, but hey, you are going to be 16.And then the greatest day of your life...you become 21.
Even the words sound like a ceremony...
YOU BECOME 21YESSSS!!! But then you turn 30. Oooohh, what happened there? Makes you sound like bad milk. He TURNED, we had to throw him out. There's no fun now, you're just a sour-dumpling.What's wrong? What's changed? You BECOME 21, you TURN 30... then you're PUSHING 40. Whoa! Put on the brakes, it's all slipping away!!! Before you know it,
you REACH 50... and your dreams are gone. But wait, you MAKE IT to 60 - you didn't think you would! So you:
BECOME 21
TURN 30
PUSH 40
REACH 50
and
MAKE IT to 60.You've built up so much speed that you... HIT 70! After that it's a day-by-day thing; you HIT Wednesday! You get into your 80s and every day is a complete cycle:
You HIT lunch
You TURN 4:30
You REACH bedtime.
My grandmother won't even buy green bananas! It's an investment, you know, and maybe a bad one! And it doesn't end there... into the 90s, you start going backwards:
"I was JUST 92."
Then a strange thing happens. If you make it over 100, you become a little kid again.
"I'm 100 and a half!"