
The whole point of iconographic signage is that it's language neutral. In theory, even a Bosnian trucker will understand it.
But when an icon can't be reliably understood without wordage, it's a useless icon. That the winners had to be text-enhanced with "Elderly people" is de facto evidence that the iconographic version Will Not Work.
As someone approaching git-dom, I'd personally favor "Old Gits" with no icon. Two syllables is much more quickly understood than the five in "Elderly persons", "old" in particular being much, much more quickly understood than "elderly." Never mind that this increases my risk of martyrdom at the hands (wheels?) of a Bosnian truck driver who understandeth not the Mother Tongue.
I'm faintly surprised no one proposed the prototypical fossil, a trilobite, as an appropriate icon.