Think you know seniors? Think about this. 70% of seniors are online. And while 77% have cell phones, only 18% have smartphones. But — and it’s a big but — they’re more likely to own a tablet than any other age group. Half of them are on Facebook. And they’re far more likely to click on ads — especially Facebook and video ads — than their younger counterparts. But nearly half don’t see especially well. If you market to seniors, that’s a lot of valuable insight. How can you use it?