Fun fact: The stock market doubles every 10 years. Actual growth is 2%-3% per year, and add inflation of 4%-5%, for roughly 7% per year—so it doubles in 10 years.

Money loses half its value every 15 years. You have to earn twice the value of your current assets within 15 years just to barely break even.
So you must find stocks that can rise 10 times within 10 years; otherwise, you might as well be doing nothing for 15 years. If you stretch it to 45 years, your purchasing power drops by 75%—what’s the difference compared to going to zero?