I'm hoping that by starting while DD's young (she's 14), she'll have the habit instilled into her before she goes off on her own. As an only child, everything we have will go to her anyway, but I know it can be quite the juggling act when you have more than one child in trying to figure out what's fair and I don't envy that position.
I found this graph for starting a Roth at age 15 vs at age 25 where the inputs are $1000 per year contributions for 4 years (i.e. 15-19 vs 25-29) then no further contributions, and money earns 7% annually:
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Nice. But the reality is that since 99’, the only asset groups to return 7% or greater have been REITs, gold, and oil. The S&P returned 5.6% annualized. You would have had to time the market to make greater returns in equities or made some great stock picks. However, the average investor over the same time period only made 1.9% annualized returns.
The problem with these charts is that the average person is a much worse investor. Warren Buffett showed how badly hedge funds performed over the last decade in his 2017 annual report.
However, starting as early as you can makes sense. Figuring out where to invest your money is hard.