The first time I saw one of these I stopped to take a picture. It just seems the most ridiculous thing to warn people about, as if somehow "elderly people" can't cross the road.
I don't understand this mindset. Do people not walk where you live, or do you not have elderly care homes? I've been to _multiple_ countries and nearly all of them with some uniform signage standard warn motorists about elderly and children crossing.
You might consider them redundant because elderly people can also cross the road where there aren't any signs, but then few warning signs aren't.