With baby boomers having to work longer just to keep up with their expenses—whether nominally retired or not -- you're correct if you think there are more older people in the workforce than before. In fact, according to Provision Living, in some cities people aged 65 or older actually make up at least 20 percent, or even more, of the workforce. Related: Top 11 best states for retirement on a fixed income Now that could be good news if you're looking for a place to "retire" where you might be able to keep your hand in at work, particularly if you're doing so because you enjoy the stimulus of the workplace rather than need to in order to survive financially. On the flip side, one might wonder whether all these seniors staying in the workforce are doing so because they just can't get by on what assets they have—particularly since, according to Provision Living, "large metro cities didn't make much of an appearance on the list," with fewer than half the cities in their top 20 having a population of 500,000 or more. Related: 5 worst, best states for pension funding Despite the cost of living and other factors that might make one think seniors would have to stay in the workforce to get by, it adds that cities like New York and Chicago didn't even finish in the top 50. Seniors fleeing the big city? Not able to find work? Or just outnumbered by the overall population? Take a look at the slides above for how it shakes out for the 10 cities with the most working seniors. READ MORE: How to keep older workers safe and productive on the job 10 ways you can help employees prepare for retirement Older women workers face tough economics