My friends (I'm 54) are probably older and more boring than yours, but like if I open Facebook right now there will be grandbaby pictures, look what I did in my shed this weekend, and politics. That's pretty much the formula year round for my timeline.
I strongly suspect that's a trend with younger people. I don't see my friends and coworkers experiencing the same type of satisfaction when posting something that I see younger users having.
Hell, I'm glad I'm not the type of old person that doesn't know how to use Facebook. Just that is really enough satisfaction for me.
It is great to take a couple story videos here and there though. I like looking at those months after.
I'm pretty sure half my friends wouldn't do the things they do if they couldn't instagram it afterwards. Like going for a hike just to have your instagram content for the day.