Sounds like Churchill.
Yes, I'm sure it was Churchill. "If you were not a liberal when you were young, I would think you had no heart. If you did not grow conservative as you grew older, I would think you had no brain." I think that's how it went.
Although often attributed to Churchill it was not something he said. http://www.winstonchurchill.org/i4a/pages/index.cfm?pageid=112
Don't know who said it though.