For me, it was just part of growing up.
I wouldn't say I am financially "successful" (although everything is relative) but I am certainly financially "literate".
Parents (and their parents before them) never got into debt, they all had mortgages but everything else was saved up for and only bought when the money was there.
I always saved (even when at school in the 70's I haf a little PT job and put half my wages away) so when I left school and got my first FT job I had enough to get a car without getting into debt. This then meant that I could immediately start saving for my next car (or other significant expense).
Starting with no debt/borrowing at this stage was to make a MASSIVE difference as I got older.
I remember at college there was a module that ran through basic finance which just reinforced all my parents had taught me. Some of it was REALLY basic (how to open a bank account, how credit worked etc) but it showed how (even in the early 80's), these things were still an enigma to some people.
My parents never had credit, everything was either saved up for or just not bought.
When they got a credit card it was for convenience and the "credit" facility was never used, instead the bill was paid off in full at the end of each and every month.
I started doing this when I got a card and stayed with it ever since, have never carried a balance across to the next month.
My parents also impressed on us the need to start a pension as soon as we could. Not many 18-year olds were very interested but I did it and it has paid dividends (letting me finish work in my 50's).
My parents also encouraged us to get a mortgage rather than spending money on rent.
While friends were moving into rented flats for "freedom", I stayed at home and after a couple of years of saving hard I could afford (just) to buy my first (rather manky) house and start on the property ladder. It was a horrible, run-down house in a scruffy area but it was "mine" and with help from M&D we turned it into a tidy little palace while in the process, taught me lots about DIY and decorating.