Some of these semi-retired workers are gig drivers for companies like Uber and DoorDash. Over half of the missing gig workers were aged 60 or older, and over 40% of them described themselves as "retired." Many of these semi-retired workers are gig drivers for companies like Uber and DoorDash. Business Insider previously spoke with six gig drivers about why they're driving during their retirement and the strategies they're using to make money. As her pay-per-ride declines and the cost of maintenance skyrockets, she's been forced to find other types of gig work.

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