I think the point is that elderly people are fairly sentient so you don't have to worry about them doing dumb things like darting out in front of a semi truck l

I think the point is that elderly people are fairly sentient so you don't have to worry about them doing dumb things like darting out in front of a semi truck like you do with kids so there's no reason to warn drivers about a high density of them since they behave like normal pedestrians if perhaps a bit slower.