Chris142-
I was inspecting brake hoses, as part of tire rotation, and the rubber looked like new. I wiggled and bent one under light pressure and it broke into two pieces at the junction where the metal line joins the rubber hose section beneath a sleeve. It was all rusted thru due to trapped moisture. The other ones were the same.It even passed the annual state safety inspection.I emailed the manufacturer about their poor corrosion protection and they did not care, saying their brake hoses net the applicable industry standards. The takeaway from this is to look further than just the rubber.
As mentioned by another poster, you don't see deteriorated hoses because you live/work in sunny southern California.