How do I know the foreign stock market will ever climb above its 2007 high?

In any of our lifetimes?

I did some back testing and learned something a bit surprising. While it is true the average annual return to date despite everything has been close to 5-6% growth a year,

Between the years of 1865 and 1932, there was absolutely 0 growth ...that would be the mortal life of a 25-year old born in 1840. So that is telling

And it's for reasons like this that not 100% of a target retirement year portfolio even for those set to retire past 2050, is fully invested in stocks vs a small allocation to longterm bonds


How do I know the foreign stock market will ever climb above its 2007 high?