I'm not as old as you guys :0 but My father always told me life is all about what you can and can't deal with.
As a private pilot myself (Currently earning my IFR endorsement) I don know there is a lot of openings for flight instructors. In fact you could buy an airplane and do your own instruction and not work for someone else. You get to fly for free, teach what you like to do, and get paid for it. However there is not a ton of money in it if you don't have a decent client base.
I think in my retirement I will be doing just that. But I am a biased.
When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11