For us, the transition to "Saving" was pretty easy. We had two daughters that we were spending thousands of dollars a year on to raise them, and when they became adults, and went out on their own, we got serious about saving. At about that same time, 401K's became available, so we just moved the "children" money into a good 401K, and that worked out quite well. We saw several people, in the same position, who, when the kids left home, bought fancy houses and cars, and started taking lavish vacations, etc., with their "extra" money. Looking back, I'm glad we chose the route we took.
In the majority of cases I've seen, where Seniors are now having to live on minimum financial resources, most of them seem to either have ongoing health problems, or they went through a nasty divorce, in their earlier years. Divorce, IMO, is a curse that can easily leave both parties "scrambling" for their futures.