Re: you needed to be able to live off the interest of the interest
Not really.
If you don't plan to have a family, living off the interest of the interest means that, when you die, there is big pile of money that will eventually be claimed by the State.
I see no reason to let the State get the money - it wastes enough as it is.
If you go to a place where your lifestyle costs you $5000 per month, you have twenty years ahead of you before having spent the capital. Interest comes on top, which will likely give you a few more months.
Back in the day, your costs would likely not have been so high, especially if you move yourself to a country where the cost of living is much lower.
Adjust your capital span accordingly.
These days, the Euromillion lottery hands out a minimum of €18 million to the top winner. Even if I try and push my lifestyle to the €10K/month bracket (you can only eat one Beef Angus steak per meal, after all), that still gives me 150 years of capital.
Forget living on the interest, you're just creating more problems instead of solving the most important one : having fun.