Older Americans who are in debt are choosing to delay their retirement, researchers conclude in a new working paper. In earlier findings released last summer, the researchers, Barbara Butrica and Nadia Karamcheva of the Urban Institute, documented the growing prevalence of borrowing since the late 1990s among adults ages 62 through 69. Median debt levels among those who owe also surged from $19,000 to $32,100, adjusted for inflation – and debts as a share of their assets increased. Now comes the rest of the story. When the researchers controlled for health, financial assets, home values, and other forms of wealth, as well as spouses’ earnings and other factors that play into decisions about retiring, they found that individuals with debt,…