I lived most of my working life outside the US, the 401k is an American concept, and only one of many sorts of retirement plans. Most of my former colleagues make well into the 6 figures and are financially stable, and at best would be only vaguely familiar with a 401k.
Btw, do you know what a SEP is? If a girl was talking about it on a date, would you know what it is? And if you didn't, would you want her questioning your maturity on some online forum? (For those of you who don't know, it's a retirement plan for self-employed people or business owners - not everyone is a corporate drone.)