To use Poshmark, you need to be at least 13 (though you should check to make sure this doesn’t go against any state laws). This is actually great news, however, as many other services we talk about here on Gig Worker require you to be at least 18 (or even 21 in the case of apps like Uber). That’s why Poshmark made it on our list of The Best Online Jobs for Teens.