I’m in my 30s and could make 3.8 million last me the rest of my life. Even if I wasn’t good at investing and just put it in an interest checking account earning 1% interest, it would earn 38,000 a year. Which is right around what I make now. There’s two of them, and you do have to account for inflation, but it really wouldn’t be difficult to get 2-3% return on that and still be able to live off the interest alone.