Apple’s streaming event from California happens today and many expect there’ll be an announcement of a new iPhone model. Speculation always abounds, because Apple is notoriously tight-lipped with these events. One thing that they have announced is a new feature in iOS that pays attention to how we walk, or our gait. The idea is that it’ll be able to tell if something’s changed about a senior citizen’s gait and that could give early warning of a fall. Marketplace’s Jed Kim speaks with Dominic Endicott, a partner and director at Northstar Ventures, which invests in “age tech.” Endicott says Apple has already introduced a feature in its watches that can tell if you’ve fallen, and it helps you call 911.