"Adults are just kids with money” is a humorous saying that has been printed on many gift items, such as posters and bumper stickers. “Adults—kids with money” has been cited in print since at least 1988.

The slightly different saying “Adults are just kids who owe money” has been cited in print since the 1990s.


25 December 1988, Orlando (FL) Sentinel, Florida section, pg. 18:
ADULTS—KIDS WITH MONEY

Multiply
funny bumper sticker quotes
by CHIVENTEENG17
Mar 17, ‘06 10:57 PM
(...)
Adults are just kids with money.

CBS News
A Toys Story
By BOB BICKNELL / CBS/ December 5, 2007, 3:34 PM
(...)
After all, adults are just kids with money.

Mail Online
James Martin: Viva la Evolution
By JAMES MARTN
Last updated at 18:04 28 December 2007
(...)
There’s nothing wrong with a bit of fun. After all, adults are just kids with more pocket money.

Nostalgic Wanderer
WEDNESDAY, FEBRUARY 13, 2008
Adults are just kids with money.
Expectations are such a huge part of our society.

Why So Serious? Blog
Friday, September 16, 2011
Adults Are Just Kids With Money
At one point or another I am asking my parents for money.

Twitter
9GAG
‏@9GAG
Adults are just kids with money.
2:02 AM - 23 Sep 12

Twitter
TED
‏@TheOfficialTed
Adults are just kids with money.
8:06 AM - 17 Nov 12