"Gray" can be used as an expression to indicate someone who is old.
How It's Used
"However, [Jay] Leno's audience in late night was heavily weighted toward viewers 50 and older—precisely the demographic that least interests big advertisers. NBC executives realize that Leno is likely to pull a grayer audience than the network is used to at that hour."
"Martin Amis has never fought shy of an argument, whether it be with the critic Terry Eagleton (over Islamist extremism), his pal Christopher Hitchens (over Stalin) or fellow novelist Julian Barnes (over Amis leaving his agent–Barnes's wife). But none of those opponents were as tough as his new target promises to be. Now 60, Amis has picked a fight with the grey power of Britain's ageing population, calling for euthanasia 'booths' on street corners where they can terminate their lives with 'a martini and a medal'."
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