We have had to be very frugal at times in our lives so I have kept the habit for everyday things. We add sweaters rather than putting the heat up and close the doors of the rooms we don't use and turn those radiators off.
In the supermarket we buy things on special offer and freeze things like meat so we always have variety. I never pay full price for washing powder, fabric softener, coffee, toothpaste, baked beans, cereal etc., etc., as we buy them when on offer and keep until we need them.
This means that when we want to go out we can do so and don't need to scrimp. I do buy clothes in sales sometimes but if I really like something I buy it because as someone else said, you can't take it with you and we have done our best for our boys so it is our turn now. We have much better holidays now than we did when the boys were around as we can afford them now.
I really don't see the point of saving for a rainy day now, we might not live that long.