Sounds like you both need to do some research on the S&P 500 performance over the last 40 years (1980-2020) https://dqydj.com/sp-500-return-calculator/
Whenever any number is used (even 7%), one needs to understand what the actual growth may be more or less for your specific timeline.
I will elaborate on this number and in my next article and the basics of long-term investment growth estimation.
The $80,000 is not promised, it is estimated (that is always a given when projected invested numbers). Even if it ended up being 1/2 of that let's say that I get $40,00 in $40,000 years, that sounds like a great gift to my-future self (considering I spent $0.00).
BTW I will actually make closer to a million off of $0 and will write about it in my next article. How much could you make $0 grow and what is your process?
Happy researching @Opher and @Drew.