Well, I learned this rather late in life, but it is a very good thing to bank/invest 50% of what you make and learn to live on the other 50%.
I wish I had made this connection when I was, you know, 14. However, it’s not too late even for me (though still a work in project thanks to lockdown), and now I try to tell this to the younger generation. Unfortunately, they so far look dubious or–apparently–even laugh. Tact and timing is needed–and also understanding because the young have little dreamy dreams, and it is sometimes hard for them to understand that although life should be a bed of roses (shouldn’t it?), it so rarely is.
Young People are also averse to the idea of working a difficult job for 10 – 12 years, investing as much of their pay as possible and then retiring at (or before) 34 to do a super-fun, potentially ill-paid job–or start a risky dream-business–as their investments merrily pay their way.