I am only 54ish and I can see the main limiting factor as being my physical health. Lets face it, If it hurts to get up and be active, you will most likely sit around alot.
I try to get out and paddle the kayak for an hour or two each day and walk to the night market a few times a week.
I like to be at home and even when we go on a trip somewhere and stay in a nice place, I am still so glad to be home.
We are lucky, as My wife has 3 sisters that she is very close to and they all live next door, so that is her entire social circle.
I am pretty much a loner here in the LOS. Not complaining, it is just that way for me.