For my children and grand children. I urge them to track their spending preferably on a spreadsheet where the can determine exactly where their money is going and how much for each item.
The idea being that you need to know where it us going before you can determine the value of what you have purchased with your precious dollar.
Many people know they are spending too much but not how foolish so much of it is. You don't have to be a genius to direct your spending to what is really important in your life. As opposed to niceties that are really not of high value or importance.
That is not to say that most of us suffer from youthful irreseponsibility or have suffered from it. Most of us would prefer to enjoy the life style our parents have or even better. Like the young farmer that wants to own equipment that is better than dads thinking that they know how to do it and dad doesn't.
BTW my helpful hints have limited success because they are so much like me at that age in that they don't want to hear it. Perhaps experience is the best teacher, but it can be a costly education.
