Imagine waking up on your 92nd birthday four or five decades from now: You need help getting from the bed to the bathroom, medication reminders, someone to make your bed up — and it would really help your bum hip if there were someone there to help you stretch it out. So, you call for Roberta. She’s strong enough to help you to the bathroom, and it’s not so embarrassing when she cleans you up. She has your medications all organized for you, and you know she’s already double-checked them against the database she updates daily. Roberta makes the bed while you take the meds with some juice she’s freshly squeezed. As she’s helping you get dressed, she reminds you to do that hip-stretching routine. Roberta does all this with ease, like the well-oiled machine...