By the topic name it seems like it is mistake to sleep with ex. But I asumed that you are like in your twenies or thirties. Laughted when read you are 66. Anyway its great that you both still got it and as long as you are having sex you are not old.
Anyway I think you should go forward and hope for the best. Cause is it money that makes you happy or is being together with people when you felt most happiest? As long as you have roof on top of your head and something to eat its alright, money is just a number.
At you are I would do anything to not to be lonely. Sure money does attract girls but what primary attracts girls is deeper things, character and such things. I mean you could be together with someone riich and steal cheat cause other things are lacking. But then again you could be together with poor guy and never cheat cause more important things are in a place.
This video can help a lot to understand how female brain works and what really attracts and what not so much. So you can better understand yourself and make a right decision.
I really find a lot of ladies over 40 to be confused which one to choose - love or money.
Doubt kills more dreams than failure ever will