CNBC, here.
S&P 500, average real return per annum, dividends fully reinvested:
August 2000 through April 2022, 21 years, 8 months . . . 4.6%;
The 21 years, 8 months previous to that, December 1978 through August 2000 . . . 12.35%.
At 4.6% it takes about 15.5 years to double your money, at 12.35% just under 6 years, which means under current circumstances you haven't yet doubled your money twice, whereas previously you would have doubled it 3.6 times.
The stellar real returns to the August 2000 top have been cut down since then from 12.35% to 8.41%. How long will it be before they are cut back to 6.44%, the long term real return from January 1871 to December 1978?
The odds are not very long.
Those stellar returns of the second half of the 20th century are an artifact of The Great Depression lows. To achieve them again will require another one.
Safety check, Vern.
