they should be forced to build their own infrastructure to support it (no idea what that looks like for delivery robots)
Tunnels, at least in heavily populated areas. They already make pipes that should be big enough. It might require a slight redesign of the bots so that they can "climb the wall" a short distance to pass each other, and maybe extend/retract some bits depending on whether they're inside or out, but my heart would not exactly bleed over the money spent. And they'd be out of sight, out of mind most of the time for the rest of us.
The difference between the 65+ bracket and the 50-64 bracket in the original data is larger than the gap between 50-64 and 30-49 on every chart I've examined so far (where they're broken out by age), so the real break is at retirement. Which makes sense: retirees are less likely to be forced into proximity with LLMs whether they want to be or not. (Interestingly, the older demographics are also less likely to think they have enough control over interactions with "AI".)