Not trying to brag or anything, but when I turned 40 my assets grew to 1m.
I am counting real state, cash, investments and retirement accounts.
Only has taken us 13 years. Started seriously investing and saving when I was 27.
So its definitely possible to accumulate 1m by 40, but very few can accomplish it.
Best part is, it has only taken next 6 years to earn one more million.