In which country?
I didn't even drive until I was 27. I'm in my 40s now, and have friends my age who still don't drive.
While the car reigns supreme in most of the US, there are still parts where it's possible to get away without one.
Do you really think that nobody works where they live? Who do you think works at all of the local shops in your town? Everybody drives in from a different city to staff your town while everyone who lives there drives out to staff another city?
I live in one of the top metro areas in the US. My commute to work is 15 minutes at 25-45MPH through residential areas.