Captain Underpants Wiki

Yeah, he lives up there on Echo Hills next to that graphic novel artist. I think his name is ... um... Harold Hutchings or something.
  —23-Year Old Son [src]  
Look, son, a giant, glow-in-the-dark robotic squid is carrying a little boy in one of its tentacles!
  —Old Lady [src]  

Old Lady and 23-Year Old Son are future versions of Little Boy and his Mom. They only appear in Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot.


Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot[]

When George and Harold use the Robo-Squid to find a adult that they trust, they come across a man and an old woman sitting on a bench. The old woman notices the boys in the Robo-Squid and points it out to her son, but he does not believe her until he sees the boys for himself.

George asks the man to find Old George Beard after he reveals that George grows up to become an author. When George asks the man where Adult George lives, the man says he lives on Echo Hill next to the novel artist Old Harold Hutchins.