As the title say, I'm 30 and have fully adopted a Bogle head point of view for my retirement. Am putting away close to 40% of my earnings towards a retirement in Indexed US stocks, International Stocks and US bonds.

Everything I read talks about the long term growth of 4-7% of my investment. It seems like the safest bet to make. 

And yet the Great Depression was so recently that my grandmother lived through it. I am concerned that I am surrounded by a specific time in human history (last 80 years) that has benefited the US market so well that everything I have read, people I have listened to, and wisdom I have sought has been very shortsighted.  

This might be a ramble and I don't think I have other safe options for my financial future but does this keep anyone else up at night?
user
What is to say this continued US economic prosperity is
assistant
As the title say, I'm 30 and have fully adopted a Bogle head point of view for my retirement. Am putting away close to 40% of my earnings towards a retirement in Indexed US stocks, International Stocks and US bonds.

Everything I read talks about the long term growth of 4-7% of my investment. It seems like the safest bet to make. 

And yet the Great Depression was so recently that my grandmother lived through it. I am concerned that I am surrounded by a specific time in human history (last 80 years) that has benefited the US market so well that everything I have read, people I have listened to, and wisdom I have sought has been very shortsighted.  

This might be a ramble and I don't think I have other safe options for my financial future but does this keep anyone else up at night?
user
I'm worried that the market has become so efficient that
assistant