it's more than enough, if you don't spend money in useless things...
It's more than enough depending where you are, but it probably won't afford the best retirement if you want to live in a metro area in an industrialized country.
if you have already the house you don't need all those money to retire seriously, i'm talking about the money needed to live a simple life, sustain taxes and food, not buying yatch big house with 30 pools, hookers and other crap
it doesn't matter where do you live, it matter more how you spend your money
Actually, it really does matter where you live. Compare the average cost of living of New York City or San Francisco, with that of Bucharest. This is why some people save up to retire to cheaper places......
one could argue that 100M aren't enough, because he want to buy a stealth fighter to travel around the world
i still thing that the important things is how you use your money