A stupid quote, and not true.
In 1984 when Perry was signing up to become a Democrat leader and the rest of Texas was supporting Reagan, Perry was 34 years old, he was not a kid, in 1988 when he was fighting for Gore he was 38, in 2008 when he was fighting for Giuliani, he was almost 60 years old.
If youre not a liberal at twenty you have no heart, if youre not a conservative at forty you have no brain.
I agree with your take on that hackneyed quote. If Churchill truly originated it, instead of just repeating it, I would have to say that it proves Churchill was as capable of expressing a shallow idea as well as a sagacious idea.