So you'll probably be in your mid-60's, in physical (and quite possibly mental) decline, no longer of use to the national workforce, your kids will have grown up and be just as bored at the prospect of having to spend any length of time with you (just as you are of doing the same with yours now), and with a lot of free time on your hands.

What are you going to fill it doing?

Take up something new? Continue doing something you've always done? Take a lot of illegal drugs and generally live out your Baaaaad Dad fantasies? Move to Venezuela? Answers below please.