S&P/TSX & S&P500 Total Return Annual Averages for 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 & 60 Years
Note that over 90-95% of professional money managers cannot beat a simple index over 20 years. That's why Warren Buffett advises everyone invest in an index fund.
Note: The calculations above ignores the effect of taxation which would be different for everyone and which would not be that great a drag on returns anyway as the dividend payout is typically in the order of 2% +/- from either index and few of the holdings are sold on an annual basis so minimal capital gains are triggered. So, if you buy and hold, which you should, the income tax is minimal. Of course if you hold them in a registered account there is no tax until redeemed. Also, note that currency gain/loss from CAD->USD on initial purchase and USD->CAD on redemption at the end of the periods for the S&P500 is not accounted for in the mix calculations.