Good point, I forgot to mention that. I think that it's possible for a lot of young people in our industry to save significantly more than 15% of their income, and so I should have said: max out your contributions to retirement accounts every year and then set things up such that you're automatically saving as much of your remaining salary as is comfortable (e.g. if you're a recent college grad working in SF, and you have roommates, you might find that this percentage is pretty high!).