Millions of older people face shrinking Social Security checks next year, the first time in a generation that payments would not rise.

The trustees who oversee Social Security are projecting there won't be a cost of living adjustment (COLA) for the next two years. That hasn't happened since automatic increases were adopted in 1975.

By law, Social Security benefits cannot go down. Nevertheless, monthly payments would drop for millions of people in the Medicare prescription drug program because the premiums, which often are deducted from Social Security payments, are scheduled to go up slightly.

About 50 million retired and disabled Americans receive Social Security benefits. The average monthly benefit for retirees is $1,153 this year. All beneficiaries received a 5.8 percent increase in January, the largest since 1982.

More than 32 million people are in the Medicare prescription drug program. Average monthly premiums are set to go from $28 this year to $30 next year, though they vary by plan. About 6 million people in the program have premiums deducted from their monthly Social Security payments, according to the Social Security Administration.