Mashuna
Ovis ex Machina
Why on earth would Lennon (John, I assume) say anything like that?
The saying is much older, falsely attributed to Churchill, and goes like this:
"If you’re not a liberal when you’re 25, you have no heart. If you’re not a conservative by the time you’re 35, you have no brain."
The originator must have been somebody who had neither heart nor brain. I know nothing else about whoever it may have been.
I think the originator was the Cowardly Lion.