"more older people are getting online"
No, they are dying and previously middle aged people are ageing to replace them. It's rare for people to try anything drastically new. The only reason for this surge is that we're getting to the point that those who were at the top end of middle age when everyone started to use the Internet are now getting to be in their 60s. Give it another 30 years so it'll be hard to find someone who hasn't "grown up" around technology then the results will be more interesting.
That's if the machines don't kill us all by then (though personally I'm hoping for zombies but you have no icon for that).