When I posted that, I was really picturing the majority of the occupants being in their 50s or older, so they've had a lot of time for their investments to start to pay off. You won't find many 20 year olds being able to say the same, granted.
If you are still young, my only tip is to start investing too. With any luck, your time will come as well.
I usually make the wild assumption that most people who post here are in San Fran.