"Gray beards" ARE inherently more intelligent.
They have survived long enough to become "Gray beards".
This isn't Mutual of Omaha's Wild Kingdom; this is the human race. We don't have to worry about being stalked by a pride while we're sleeping, or ambushed by a croc when we get a drink of water. It's fairly easy for human beings to grow old.
However, if that's not enough to convince you than consider that the very same people you hate today (socialists and bleeding-heart liberals, champions of global warming, wall street scammers, murders and rapists, people who work at starbucks, etc...) will, in fact, one day grow old, and some of them will get a hankering to dangle a sign reflecting their beliefs.
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