Christian Borrero, who was born with cerebral palsy, works as a receptionist at a landscaping company in Independence, Ohio, June 14, 2018

The number of Americans seeking Social Security disability benefits is plunging, a startling reversal of a decades-old trend that threatened the program's solvency. It is the latest evidence of a stronger economy pulling people back into the job market or preventing workers from being sidelined in the first place.

The drop is so significant that the agency has revised its estimates of how long the program will continue to be financially secure. This month, the government announced that the program would not run out of money until 2032, four years later than its previous estimate last year. Two years ago, the government had warned that the funds might be depleted by 2023.