Three quotes come to mind as I post this.
"You can take the boy out of the city but you can't take the city out of the boy."
"The more things change, the more things stay the same."
"You don't stop playing because you grow old, but you grow old because you stop playing."
I'm not sure exactly how they relate to each other. My only thought is that I could combine them to say, "no matter how old you are, riding on a Big Wheel is always awesome. Especially when there is a really big hill."